Sounds like good old fashioned severe anxiety. For me it is horrible and most often inexplicable. Is it always with you now? Do you have any benzos or anti-anxiety meds available? Believe it or not, I handle severe anxiety with sex or masterbation. If that isn't possible, I try to leave the situation and give myself a pep talk or try deep breathing. Meditation may also help. Sleep also helps sometimes. I would certainly discuss this with your pdoc because there are meds that can help.