You are in a monogamous long term relationship. I'm sure this will not be the first time someone says to you that you need to seek help for anxiety. It's now interfering with simple enjoyment with your partner. You know she doesn't have HIV. But your anxious brain won't quiet. So, stop talking about HIV and start talking about anxiety with your doctor. Otherwise, you will be stuck in this loop forever and it has to be getting old. So, treating your anxiety is how you get over irrational HIV fear. That's it.