Yes. There are many medications that have FDA approval to treat anxiety disorders. Several members of the benzodiazepine class are routinely used to provide relief from anxiety. These minor tranquillizers are safe and effective, but should be used for short-term relief. They have many side effects, including drowsiness, and can be habit forming at higher doses. People taking these medications should not use heavy machinery or drive until they understand how the medication might affect them.
In people with anxiety disorders, the brain circuitry that controls the threat response goes awry. At the heart of the circuit is the amygdala, a structure that flags incoming signals as worrisome and communicates with other parts of the brain to put the body on alert for danger. Early life events, especially traumatic ones, can program the circuitry so that it is oversensitive and sends out alarms too frequently and with only minor provocations. Survival mandates a system for perceiving threats and taking quick, automatic action, but those with anxiety see threats where there are none, perhaps because emotional memories color their perceptions.
Not everyone understands is that someone with an anxiety disorder cannot "just let things go". This makes the struggle with an anxiety disorder even harder, and may prevent one from looking for help. However, it is very important to talk about these anxieties with someone and preferably find a health care professional as soon as you experience these symptoms. Anxiety should be considered as severe as a physical disease; however, most people in society do not appreciate the severity of this disorder. Some people may consider anxiety a fault or a weakness; however, it may help if people realize that many research studies have demonstrated biological explanations for (some of) the symptoms observed in anxiety disorders. Brain scans have demonstrated brain abnormalities in certain anxiety disorders, and also altered brain functioning has been demonstrated for individuals with anxiety disorders. Furthermore, there is some evidence that anxiety disorders might be linked to chemical imbalances in the brain.
But flashbacks may occur with other types of anxiety as well. Some research, including a 2006 study in the Journal of Anxiety Disorders, suggests that some people with social anxiety have PTSD-like flashbacks of experiences that might not seem obviously traumatic, such as being publicly ridiculed. These people may even avoid reminders of the experience—another symptom reminiscent of PTSD.