You had a false positive ELISA test, an unfortunate circumstance which occurs in about 1 out of every 10,000 persons without HIV. The second step, the Western blot helps to identify these situations and the negative test is a clear indication that you do not have HIV. I am comfortable with the result as it stands but I can also understand that many doctors (and patients in this situation) might want to be doubly sure (i.e. get a “tie-breaker”). If you wanted to verify this immediately, this is one of the few situations where asking your doctor to do an HIV RNA PCR test might be helpful. If this too is negative, as I am confident it would be, you could be sure that you did not have HIV.
Either way, my counsel is to believe the lab tests. You have no evidence of HIV and there is no plausible reason why you need to worry about this for six months. I think your doctor is being conservative and I would not fault him/her for that but also realize that you pay a price in terms of anxiety, the condom of a reminder of both your encounter with the CSW and your false positive test, etc. I would not have made the recommendation but again, I can’t fault your doctor for being careful. (BTW, although you did not ask, your false positive result may be something that you have forever or it may be transient, thus re-testing in the future is of interest for this reason as well as in terms of just being conservative).
Hope this makes sense and is helpful. EWH