Obsessive Compulsive Disorder (OCD) Support Group
Obsessive-compulsive disorder (OCD) is a psychiatric disorder, more specifically, an anxiety disorder. OCD is manifested in a variety of forms, but is most commonly characterized by a subject's obsessive (repetitive, distressing, intrusive) thoughts and related compulsions (tasks or rituals) which attempt to neutralize the obsessions.

You can get better.
You are not alone, I also have intrusive thoughts and severe OCD. One of the so many intrusive thoughts I have to battle is the same as the one you described when using the restroom, I was put on several anti-depressants in the past and underwent therapy, those two together did help a lot but I usually relapse after a couple of months particularly when I'm being subjected to lots of stress.
Currently, I am under a lot of stress which explains why my intrusive thoughts are so very back again! I am currently on paxil and have just been put on seroquel hoping that would help me. I strongly advise you to see a psychiatrist, he/she would help a lot.
In the mean time, if you need to talk, feel free to message me.
Cheers,