Idk if you are still going through these problems as of today or if you still even check on here but I'll try to help anyway.
I have been going through the same problems as you recently. I have been reading your posts and the both of us are almost EXACTLY alike. If you get this message, I would like to discuss this with you if you ever have the chance.
Anyways, it sounds like you obviously feel a lot for this girl and you probably do love her since you wouldn't be stressing over this if you didn't love her.
OCD is one of the most painful things anyone can go through next to depression. Strangely, I have felt the most relief when I was in great physical pain just the other day. My girlfriend took care of me and I felt like all of the anxiety and OCD just disappeared from my mind. It came back but it is less severe now.
OCD is basically when your mind, emotions, and feelings betray you. It makes you think things that are not true which then lead to feelings that are not really there. OCD is a corruption that does not want you to be happy, it wants you to worry.
The best way to get past worrying? Stop worrying. Easier said than done but just get your mind off of it. Do things you enjoy, hang out with friends. Discuss these feelings to somebody if you have to just to get it out of your head. We're both fighting it, and we both can beat it.