The thing about therapy and medication and all that is that they do help a bit in their own way, but what they do most of all is help you help yourself. It’s not a pointless thing, a therapist’s goal is to help you make realizations and facilitate your work towards managing this, they can’t really tell you what to do or how to cure things. I know it can feel hopeless sometimes, but you are making progress.
OCD has become a fixture in your life, it’s programmed deep into your brain, and that can be managed and you can start to undo that programming, but it will take time. You just have to hang in there and keep working for it, do what you can to make your therapy work around your job.
Again, I’d like to suggest you ask your therapist about ERP (Exposure and Response Prevention) therapy. If he can’t do it, then ask about a therapist that can. I think that you might benefit from that a lot, because it’s not always possible to not be in a situation that will trigger your compulsions.