It doesn't sound like normal religious fear to me, so I suppose it would be classed as OCD. But Micha, you don't have to worry about those "promises", even though you can't seem to control the temptation to make them. God knows your true mind and heart better than anyone ever could, better even than you yourself do. He isn't going to be offended or angered by "promises" you make that are the result of obsessive fears or anxieties. So try not to get scared or ashamed if you keep on making those "promises" when you don't truly want to. They won't change His love towards you. He made you and He knows you and He loves you.
What you're struggling with is something probably every human being goes through in some form or another, whether or not it's diagnosed as OCD. The Apostle Paul gives a very helpful description of it in Romans 7:15-25 — the problem itself, and finally the solution to it. I'll quote it from the New Living Translation:
I don’t really understand myself, for I want to do what is right, but I don’t do it. Instead, I do what I hate. But if I know that what I am doing is wrong, this shows that I agree that the law is good. So I am not the one doing wrong; it is sin living in me that does it.
And I know that nothing good lives in me, that is, in my sinful nature. I want to do what is right, but I can’t. I want to do what is good, but I don’t. I don’t want to do what is wrong, but I do it anyway. But if I do what I don’t want to do, I am not really the one doing wrong; it is sin living in me that does it.
I have discovered this principle of life—that when I want to do what is right, I inevitably do what is wrong. I love God’s law with all my heart. But there is another power within me that is at war with my mind. This power makes me a slave to the sin that is still within me. Oh, what a miserable person I am! Who will free me from this life that is dominated by sin and death? Thank God! The answer is in Jesus Christ our Lord.
So you're not alone, and you're not truly struggling with anything that is foreign to human nature in general, even if it seems extreme. Evil uses all kinds of tricks and absurd fears and fixations to try to keep us from thinking clearly and truly knowing and loving and obeying God. But the good news is, it can't win. It's already been defeated, really.
Just keep forging ahead, no matter how tough it seems, Micha. Make sure you've got people to talk to when you need to, someone you trust and who understands and won't judge you for these obsessive thoughts that are not really you or yours anyway — a good therapist or a minister or a close friend at your church. That always helps. But you do already have the answer you most need, and you can turn to it — to Him — any time, all the time, for sure. Keep it up.