To me Panic and Anxiety attacks are the direct result of Cognitive Dissonance. Two (or more) opposing beliefs kept at bay for extended periods by unfounded logic simply can't coexist in the subconscious without some sort of unpleasant physical manifestation occuring.
I survived the last few years in my Career as a life long JW by having a small container of beer on hand in my vehicle on meeting nights. I'm not in any way a drinker so only a mouthfull or two would do the trick. This was the only thing that could stave off the horrible anxiety quickly. I wound up being only able to go to the Sunday meeting and I'd have to step outside during the intermission and have a mouthful of beer or drive to a near by mini-mart to get some. Isn't that the saddest craziest thing you've ever heard of anyone having to do in order to survive a meeting?
The very week I made up my mind to quit altogether, the panic and anxiety stopped and they haven't returned in over three years.
Jw's will tell you you aren't leaning on Jehovah enough or that Satan is testing you. Don't beleive it, your inner voice is demanding that you listen to it and it won't go away until it has been given the proper attention.