We are sorry that you are suffering so much, but as noted, we can't offer anxiety counseling in our HIV Prevention forum that will help you accept that you didn't have a risk for HIV. We wish you the best, but we are closing this thread.
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Please seek professional counseling to help you overcome this irrational fear. You didn't "stupidly" have sex with your girlfriend. You don't have HIV so you can't infect her. She shouldn't get PEP because you can't infect her, since you don't have HIV.
We can't assist with your anxiety, and we can't hold your hand until you put it past you or get your negative test results. We can only give you medical facts. You had no risk for HIV.