Good to hear that you feel that you can work with what is going on. It did seem to be pointing to OCD to me. You don't have to have both obsessions and compulsions to have OCD but if you do have compulsions then it shifts it way from other things that also have obsessions.

What you describe doing--stopping yourself, asking questions, challenging how automatic you jumped to a negative view, and what were alternatives--this is actually what therapy for OCD is like. So you have figured out how to handle it on your own.