Your problems is NOT the infection but the WORRY. Do Not worry, if so many tests have come negative, you are NOT having
HIV.
Most persons who go for HIV tests need to undergo a pretest and post test counseling. Looks like you have NOT got the counseling done.
If you have the incident making you worry about contracting HIV, then it must be atleast 8 m old now. So if you were to catch the infection, it would have shown positive by now.
If you have doubts about it, you can meet a sexologist in your area and get the doubts cleared.
Next Steps
Google for a sexologist in your city and meet the concerned doctor.
Health Tips
I hope this has instilled in you the fact that one must be safe than sorry. and being unsafe may cause worry if not the infection. Hence use condoms at sex, always.