I had almost a similar experience several years ago.
I had just disclosed to my family - I went in for a physical and was very triggered by the prostate exam. At one point, he said, "Ok, Dan, breathe" I was so tense.
Here's the funny part, when I was in my early 20's, I had a bad prostate infection. I had many many many prostate exams in that time, and although unpleasant (the infection made it very uncomfortable), I was not triggered... then, at the age of 40, I was back in the basement again - full of shame, guilt... I felt so dirty and "bad".
It has gotten better - the last time was no big deal at all... so as Cbfull said, you are experiencing something very normal considering your past.
"You should listen to your heart, and not the voices in your head."