I can relate. It's never been to the extent that you describe, but I have been through a time where my thoughts would go to my brother during sex, or to being in love with him and wanting to have sex with him at other times. I went through quite a long time where as I spoke to just about any man (including my dad, other family, friends, and random strangers), my thoughts suddenly became a fantasy of asking him to have sex with me.
I think for me, I was lucky enough to grow out of it. But I still have some suggestions for you. You mentioned that you are on medication - perhaps either that med needs to be changed, or you need a med for OCD added. If you can, I suggest you finding a good psychiatrist - one who will listen to you and try you on different meds or a combination, and stick with it until you get it right.
If you can, it might also be worth finding a therapist you feel comfortable talking about this with. Even better if it's someone who specialises in OCD. Alternatively, you might like to look into self help. CBT (cognitive-behavioural therapy) is frequently used to treat OCD, and there are plenty of online resources and books that deal with that.
Please know that you aren't alone. I know how terrible it feels to have thoughts that sicken you and to feel like you have no control over them. And then to have it effect the rest of your life. I completely understand that you want the thoughts and sickness to stop, and that sometimes it feels like the only way to do that is to cut out bits of the brain (even though you don't want to die). I really hope that you are able to find some relief soon.
deadgirlwalking wrote: I find myself hating anyone who dares complain about anything less than this.
I can completely understand that, too. My sister is somewhat depressed, and I lose it (internally) when she starts going on about it.