hi anthony_james. i'm sorry to read about your experience. i have sympathy for it, as i developed anxiety disorder too, after my marriage exploded.
I keep asking myself what are you afraid of ? I am really clueless.
this is not uncommon, that a person can't put a finger on the reason. it may be lingering trauma from your relationship. if it ended not too long ago, it may still be resonating in your unconscious. panic disorder is a very unpredictable thing. i know that mine is caused by the way my marriage ended, and is compounded by the unpredictability of the negotiation phase of my divorce. however, from one day to the next i have no way to tell if i will have an attack. i can't locate any sure triggers. i carry clonazepam with me all the time, just in case. please don't worry yourself that you can't figure out what the reason is. these are horrid feelings and you will want to reduce them, whatever the cause. did your counselor suggest medication? and if your counselor gave you calming techniques, you may want to use them, panic attacks or no. the daily practice of breathing or visualization or prayer has accumulating benefits.
do you think you could start again with the counselor? have you examined the other aspects of your life, to exclude them? how are things with work?