Panic attacks are very intrusive and disturbing, but in general they are not dangerous. They may lead to agoraphobia or other anxiety disorders. You mention that you have taken SSRI's. I would suggest that you discuss the pro's and con's of benzodiazapines with your prescribing doctor. SNRI's are also an effective treatment. Lastly although you have been in therapy have you been in Cognitive Behavioral Therapy or CBT?
I would recommend the use of Cognitive Behavioral Therapy. In CBT, one is taught new ways of thinking and behaving and as a result, one's mood improves. anxiety and panic attacks decrease. In addition CBT is evidenced based as the most effective form of treating anxiety. See:
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First you are clearly not psychotic and the disturbing thoughts are quite common as to be part of the disorder. That is why I suggested considering using CBT and benzodiazapine medication. Even if only for a short time, or occasionally when the situation demands relief.