I've read a lot of messed up stuff as well (when I was younger and didn't have as good a sense of moral boundaries and my own triggers) that made me feel incredibly guilty. But remember that while you may have enjoyed reading that stuff in the moment (which is understandable - even unethical content can be written well), you clearly felt guilty aft......
First off, I would suggest that when you go to the doctor's appointment, you ask if you can be alone with the doctor to ask some questions. (Most doctors, where I live, have to do that. Ask your doctor if they can potentially help you; you don't have to go into details about the situation, but maybe tell them a little as to why you're not comfort......
Can i stop being guilty about it?