Wow, there is really a lot going on here. Glad to hear you're seeing someone. I'll just share some of my thoughts and you can take or leave them.
You're talking a lot about your emotional response to porn: hate, disgust, anxiety.
Seeing a doctor is not a bad idea. My experience has been that no sooner do you get reassurance that your current concerns are unrealistic than your ocd will throw up some new problem. From what I've seen that isn't uncommon in the likes of us.
Yes, it's difficult. I had shortness of breath for months after a chemical exposure. What I did was to see the doctor to rule out any physiological cause. He sent me for a lung function test, and when that came back okay it gave me the confidence to believe my symptom was psychosomatic.