Hey, Luke.
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.
Dan
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"You should listen to your heart, and not the voices in your head."
Marge Simpson