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It appears you have quite a bit to unravel. You've taken an excellent step in retaining a trained OCD therapist. S/he will probably introduce you to ERP therapy, which is the gold standard for OCD treatment. Stick with the therapy, and you'll get results. Concerning your living arrangement, I married a woman with three kids, high school to college age. I moved from my home into hers. The smartest thing I did was not to press her kids. I let them be themselves, especially the boy, who was wary of me. Over time, we've gotten close. In my humble opinion, the things to keep in mind is it's not all about you. Your girlfriend and her kids have lives and pasts, too, If you try to force them to adhere to your rules you'll lose them. Hope this helps.

Pure "O" or thought based OCD is totally valid. My compulsions don't really involve doing anything grand. Most of the time it's just rumination or intense mental reveiwng this also counts as ocd. I will also say, I have ADHD as well, and am taking medication for it. I find that my ADHD medication actually helps a bit with my constant OCD ruminations, it makes the thoughts less sticky. I would say the fastest way to look into treatment for ADHD or receiving medication is to speak to a psychiatrist. I know when people go through other doctors they make you take all these expensive tests.