A related discussion, NO DIAGNOSIS YET was started.
Welcome to the forum.
You had accurate replies to a briefer version of this question on the HIV prevention community forum a few months ago. As you were told, you had an essentially zero risk exposure with regard to HIV, in a country where well under 1 in 100 sex workers have HIV (probably closer to 1 in 1,000). And as we have said innumerable times on this forum, HIV test results always overrule symptoms and exposure history in judging whether or not someone has HIV, as long as testing is done sufficiently long after exposure. There are no exceptions, and there are no extenuating circumstances that change it -- no matter how typical the symptoms are (yours are not, since HIV rarely if ever causes neuropathy or polyarthritis as the main or only symptom), no matter how high risk the exposure (yours was zero), and regardless of other illnesses, antibiotic treatment, or anything else. So for certain you don't have HIV.
As for other STDs, no STD is a likely cause of arthritis, Guilliain Barre syndrome, or the other symptoms you describe. I am confident your symptoms are unrelated to the sexual exposures you have mentioned -- just a coincidence of timing. It is possible you indeed acquired your molluscum contagiosum at that time, but i'm inclined to doubt it, given the nature of the exposure and the apparent time (6 months or more?) after the event.
Beyond that, I have no thoughts about other causes. We avoid speculating on this forum about causes of symptoms other than HIV or other STDs. If they continue, I would advise you to continue to work with your doctor on it. I also encourage you to pick one physician and stick with him or her, or whatever consultants he or she may recommend.
Good luck with it-- HHH, MD