Drumming man,
Sorry to hear you are struggling so much. I will pray to God for peace and joy to fill your soul. I will pray that you will be comforted and that you will know that God loves you and you are not condemned. That you are accepted just the way you are.
OCD can have both mental and physical abnormalities. Thinking a thought (breathing out with a wrong motive) only causes more anxiety and obsession and then you feel worse. So, it's a cycle and a chain reaction that can feel very overwhelming, confusing, and frustrating.
Here is a very helpful excerpt from a website I recently found:
"decide to accept your obsessions instead of resist them. This is the toughest of all four, and it is the most important. This one is the basis of all the self-help interventions we'll talk about. Because the more you resist your obsessions, the stronger they become. It's as though your solution to the problem actually increases the problem. You resist the symptom, and it persists. So you need a new inner voice that says, "It's OK that I'm obsessing right now." This is not saying, "it's OK in the next 20 minutes to do it"; it's not saying, "I'm going to continue to do it." But I am asking you to say, "It's OK that I just had that thought." I know that sounds like a crazy thing to say. You are trying desperately to rid yourself of these terrible thoughts, and I instructing you to accept them! Accepting the obsession generally looks like a bad idea to people.
But what's the other choice? The other choice is to say, "It's terrible that I had that thought." And what's the reaction that you're going to have physiologically when you make that statement? That statement's going to produce more anxiety."
Obsessive-Compulsive Disorder What to do During Obsessing
Realizing your thoughts on your breathing is simply an obsession, recognize this and say, "there it is again...I know what's going on...its just a thought about breathing.."
Since hyping up all of our thoughts seems to be detrimental, why not try to downplay it?
Distracting yourself can also be a great way to relieve discomfort.
I hope this helps!