Nervous System and Trauma Specialists
Many meditators have found that trauma specialists have been helpful for a wide range of meditation-induced nervous system dysregulation, including anxiety, panic, flashbacks, and dissociation. There are many types of trauma therapy. Many meditators have found the following somatically-oriented approaches helpful:
Trauma practitioners are available in many different countries, and some work via Skype, some take insurance. These practitioners will probably not be specialists in meditation, but will be able to help with a dysregulated nervous system, regardless of cause.
See also mindfulness + trauma resources.