Doctor visit triggered a fantasy

About a month ago I went to a primary care physician for the first time (I just recently stopped seeing my pediatrician). I always get very nervous about going to the doctors. It has been an issue for as long as I can remember, and I skipped a few years when I was a kid because I convinced my parents I didn't need to go. The nurse asked if I wanted a pap smear, which freaked me out because I wasn't expecting that at all. To be honest, I didn't think primary care doctors did that exam. Anyway, I declined but it shook me up and I imagined that I might have to fight my doctor on it when she came in, so I prepared all kinds of things I would say. Luckily, she didn't push the issue.

Anyway, my doctor commented on my nervousness when she was taking my blood pressure, so I guess I didn't hide it very well. Then she said she was going to do a breast exam. My pediatrician had always very briefly felt around under the robe and that was that (which was embarrassing enough). But I was alarmed when this doctor exposed me and even worse when she put my arm behind my head. It made me feel humiliated and defenseless, but I let her do it. Afterwards, I felt very disturbed and couldn't stop thinking about it. Even with everything on, I felt exposed all day and I felt like I had been raped on some level (though of course, I experienced nothing even close to someone who had actually been raped- I just mean that I felt powerless and taken advantage of in the situation). I completely understand logically that I blew this out of proportion. My doctor was nice, friendly, and professional. I guess I was caught off guard not knowing what would happen.

After that happened (but definitely not during), on some level I also kind of liked it. I had a phase where I masturbated about 3 times a day, which is a lot for me. I started reading stories online about people being turned on by doctors. It has been weeks and though I don't really think about the specific incident anymore and no longer have fresh feelings of shame about it, the doctor fantasies have stuck with me. I guess I'm just wondering if this is normal, and why you might think this has happened. I feel uneasy and weird about it.