Welcome to the forum. Unfortunately, it is the wrong one; see the statement at the top of the page "questions and support pertaining to sexually transmitted diseases other than HIV/AIDS".
You had accurate advice on the HIV community forum. The chance of catching HIV from the exposures you describe is very low, but not zero. (Next time, use condoms for goodness' sake!) Your symptoms do not suggest HIV. About 80-90% of newly infected people have positive HIV test results within 25 days, so your negative result is reassuring but not definitive. Given a) the low risk of infection from the exposures decribed, b) the lack of symptoms suggestive of HIV, and c) the 80-90% test reliability, there's probably less than 1 chance in 100,000 you have HIV. To make it 100% certain you weren't infected, have another test 6-8 weeks after the last exposure.
Because it's the wrong forum, there can't be any follow-up comments or discussion. You could re-post on the HIV forum, but the reply would be the same so I suggest you not spend another posting fee.
Really, don't worry about HIV; you don't have it. If your symptoms persist, continue to work with your doctor about it.