Absolutely nothing that happened at the clinic put you at any risk for HIV. NOTHING.
And nothing that happened after you left the clinic put you at risk.
I don't know why you were getting tested, I don't know what your exposure risk was, so I can't, in all honesty, say you have NO RISK for HIV. I can say you have NO RISK from the clinic.
Are you getting any help for your OCD? If you have no insurance, call the DSHS and begin your search there for a therapist to help you. It is a very exhausting condition, but there is a lot of help and hope. Please give some thought to getting help for it. There is no reason you must continue to live with it.
I also advocate getting educated about HIV. Once you learn about this virus, a great deal of your anxiety concerning it will go away. In fact, if you had that knowledge, you wouldn't have had to write this post.
I wish you the very best
Peace
Greenlydia