I wouldn't characterize what I was experiencing when going to work as panic attacks, but I would start feeling anxious, my blood pressure was getting out of control, my stomach hurt all the time, and I went years without having a nice solid BM. I almost died because I didn't go to the hospital until my appendix had been ruptured for a week, because nothing felt that much worse to me than normal. After I retired everything started getting better.
God Bless You.