An anxiety or panic attack often comes on suddenly, with symptoms peaking within 10 minutes. For doctors to diagnose a panic attack, they look for at least four of the following signs: sweating, trembling, shortness of breath, a choking sensation, chest pain, nausea, dizziness, fear of losing your mind, fear of dying, feeling hot or cold, numbness or tingling, a racing heart (heart palpitations), and feeling unusually detached from yourself.
Panic attacks may also occur due to short-term stressors. Significant personal loss, including an emotional attachment to a romantic partner, life transitions, and significant life changes may all trigger a panic attack to occur. A person with an anxious temperament, excessive need for reassurance, hypochondriacal fears,[14] overcautious view of the world,[9] and cumulative stress have been correlated with panic attacks. In adolescents, social transitions may also be a cause.[15]
An anxiety or panic attack often comes on suddenly, with symptoms peaking within 10 minutes. For doctors to diagnose a panic attack, they look for at least four of the following signs: sweating, trembling, shortness of breath, a choking sensation, chest pain, nausea, dizziness, fear of losing your mind, fear of dying, feeling hot or cold, numbness or tingling, a racing heart (heart palpitations), and feeling unusually detached from yourself.
Panic attacks can occur unexpectedly during a calm state or in an anxious state. Although panic attacks are a defining characteristic of panic disorder, it is not uncommon for individuals to experience panic attacks in the context of other psychological disorders. For example, someone with social anxiety disorder might have a panic attack before giving a talk at a conference and someone with obsessive-compulsive disorder might have a panic attack when prevented from engaging in a ritual or compulsion.  
I felt pretty much like a anxiety attack today and I felt like nausea, puked literally green fluid. And then after a while felt relieved. Suddenly felt like nausea and was burping real bad and then I go to the toilet and then sat on the floor and thank god I had two of my besties at home to support me holding my hands and asked me to calm down. Since it clicked me that something is getting extra in my body I started breathing fast and then kept saying “I am strong” and came out to my bedroom and started working out jumping like crazy for almost 5 minutes and then all the shivering went away. Finally I vomited once again and then after reaching hospital and getting intravenous injection I felt relieved. Just to make sure nothing is really wrong I went to visit a general physician and he gave me meds and suggested looking at my fear for a sonography. Turns out I need to relax.

A person with separation anxiety disorder is excessively fearful or anxious about separation from those with whom he or she is attached. The feeling is beyond what is appropriate for the person’s age, persists (at least four weeks in children and six months in adults) and causes problems functioning. A person with separation anxiety disorder may be persistently worried about losing the person closest to him or her, may be reluctant or refuse to go out or sleep away from home or without that person, or may experience nightmares about separation. Physical symptoms of distress often develop in childhood, but symptoms can carry though adulthood.
Panic attacks involve sudden feelings of terror that strike without warning. These episodes can occur at any time, even during sleep. People experiencing a panic attack may believe they are having a heart attack or they are dying or going crazy. The fear and terror that a person experiences during a panic attack are not in proportion to the true situation and may be unrelated to what is happening around them. Most people with panic attacks experience several of the following symptoms:
In a decision context, unpredictability or uncertainty may trigger emotional responses in anxious individuals that systematically alter decision-making.[46] There are primarily two forms of this anxiety type. The first form refers to a choice in which there are multiple potential outcomes with known or calculable probabilities. The second form refers to the uncertainty and ambiguity related to a decision context in which there are multiple possible outcomes with unknown probabilities.[46]

Panic disorder is thought to have a psychobiological conceptualization (Craske & Barlow, 2007). This does not mean that panic attacks are due to a biological disease. What this does mean is that there are certain biological factors that may be inherited or passed on through genes, and thus may lead some people to be more likely than others to experience panic disorder symptoms. This is likely why panic disorder seems to run in families. In other words, if one family member has panic disorder, the other family members are more likely to experience panic symptoms or panic disorder compared to people without a family history of panic disorder. It is very important to note that just inheriting these vulnerabilities to panic does not make the onset of panic attacks inevitable or unalterable. In fact, it is possible to think and act in ways that prevent panic attacks.
Cognitive Behavioral Therapy (CBT) is an example of one type of psychotherapy that can help people with anxiety disorders. It teaches people different ways of thinking, behaving, and reacting to anxiety-producing and fearful objects and situations. CBT can also help people learn and practice social skills, which is vital for treating social anxiety disorder.
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