welcome to HCM!
I have gone through your question carefully, from the question it looks that you have fear of getting HIV from some risky behavior and now you have done
HIV test several time, each time it was negative.
As you yourself said that the test is negative, and repeating it several times is not required. you have developed fear and
anxiety related to this which is making you do it even after it comes negative. more over, from the question it is to apparent that you are sure that the contact was from some HIV positive patient, so , there is also a chance that it was a non HIV contact!
I think even if you will get the test done once again, it will not lessen your fear. Had I been at your place, I would meet some psychologist/
psychiatrist and get myself interviewed.
I feel that with
counselling sessions and may be some anti anxiety medicine this fear will go and you wil be able to concentrate on better and more valuable things in life once again.
I hope the reply helps you
feel free to ask more questions
Dr. Manisha Gopal