You're in a good place with the folks on this board. As you probably know there are many books out there which describe your situation, so don't think that you are alone. Read on through some of the posts and you will see what others are going through. When my OCD kicked in for the long haul about 5 years ago I was like you, mentally out of control and constantly thinking the thoughts and what can I do to stop them. Everything, including logic just seems so unreasonable and unexceptable to the intrusive thinking of an OCDer.
Hang in there, there are many of us here to help.