Since the head of your penis (and thus, your urethra) was covered for the duration of intercourse, you did not have ANY risk for HIV. As long as the head of your penis still has a condom over it, it does not matter if the condom slips.
There is no chance that you are infected with HIV, and you do not need a test.
You have over-tested. Your 12 weeks negative was conclusive.
Most people that over-test have issue with some anxiety disorder, your symptoms have nothing to do with HIV, it's easy to guess that your severe anxiety is the cause of it.
If you had an compromised immune system you would have been in a hospital instead of having the luxury of lying on your bed and typing on MedHelp.
We have already told you that you don't have HIV, please move along.