I completely understand that the OP has terrible anxiety.
Health anxiety must be horrendous to suffer from but it cripples people's loved ones. My mother suffers from it and it has destroyed every one of her relationships. Every month there is a different reason she is going to die, she is happy to share these fears with everyone including her young grandchildren.
HA has left her alone, bitter and terrified. Unapologetically, I believe that people who suffer from HA who don't seek treatment are incredibly selfish.
OP is so, so unlikely to have HIV that yes, I am offended on behalf of a relative who has an actual life threatening illness.
Health anxiety is real and I don't doubt that it must be horrendous to live with because I've seen the fallout from it for nearly 40 years.
In this case the OP stated that the HIV test isn't because her health professionals think she has it, it's part of a wider screening process. I've had that many times due to my own life limiting condition. Every time I used reason and logic to understand that the likelihood of having HIV was vanishingly small.
I am simply encouraging the OP to do the same.
And I think more people should.
Again - seek treatment for HA because it literally can destroy your life and make people around you distance themselves forever.