Part of the paranoia is the doctor pressing you for a list of sexual partner names from you, statements of you have a legal obligation to contact those you have been active with or they will have a nurse contact them, etc etc.
A year or so ago I had a friend share with me over a lunch that a nurse has contacted him and that a lady he had a short fling with had tested positive and given his name/number to the clinic. Note they did not identify who gave his name, he simply was able to deduce who it was due to his limited partner count over the last year or two.
We talked about his obligation to go to that particular clinic or elsewhere, if he would be required to give his results to the nurse who notified him, would he have to share his list of partners if he did test positive, etc.
I can still remember the stress he was under, not use to being tested regularly, the process, etc.
Ultimately he did not have anything (dodged a bullet) and shared with me the doctor he visited with, when asked, suggested 'they appreciate receiving the names of possible partners that could be infected if someone does test positive and some will push hard for it, ultimately it's the client's choice if they do share or not'. This is just one doctor's opinion passed along here for discussion.
Noting once again a nurse can call that person to advise them to get tested - but obviously if the person they are calling only had 1-2 partners say in the last year or more - they would likely figure out who gave their name, possibly freak out them, etc.
For those who want to be tested regularly (and we support you) and resisting for any reason, such as the one above I just described, for a few dollars you have these options (as I have shared in another thread recently):
https://www.letsgetchecked.com/ca/en/
Specifically related to sexual health testing are these bundle packages:
https://www.letsgetchecked.com/ca/en/home-std-test/