The OCD WON'T STOP PLEASE HELP

I have OCD, ADHD, and Autism. What troubles me the most is the OCD. OCD is hwen you have intrusive thoughts, like fears of great disaster, which lead to compulsive rituals or habits....for instance, one type of OCD is where someone scared of germs will routinely wash their hands over....and over....and over....and over until their hands get raw and hurt and they can't function due to all the time spent washing their hands. I have a fear of abandonment or lonliness. So I routinely check forums, and obsess over marriage. Although due to the mixture of my autism, it seemed like I also have fixations which don't go away for a long time, where I develop an interest and become obsessed with it for a time.....when i was a kid, it was animals, then it was writing, then it was cars, then it was professional sports, then it was fearing my parents would "raise me wrong", then it was avoiding taking medication, then it was fear of school, then it was fear of jinni possession, then it was marriage. I need help. Someone, please help me.... I have thoughts of killing myself or at least hurting myself so i wont go to hell, but no one seems to care.