Fear of catching hiv. Re assurance.

Dear sir. I am having very fear about catching hiv. I am not having any sexual activities and blood transfusion. But my mind is going to over thinking of catching hiv. I dont have any physical symptoms. I was adicted to hiv blood test since 4 months. I got 16 tests which all got negative and non reactive. During this tests (my 13th test ) i visited one unequimente lab in last week, lab technician first tested some hiv strip  test it came undetermine result. Since he told me that i am using this type of kit for first time. That time i got tensed. Again immediatly he done tridot test in front of me it came excellent negative results. Next day again i went to a very famous clince and tested for hiv and hbsag both are came negative results.  Again same day evng i went another clinic given blood for hiv test.  As usual result came negative. I know i am safe. But i am not controlling this fear.  I fully adicted for google search which give some times confussion and some times re assurance.