Welcome fo the forum. I'm happy to confirm the accurate replies you had on the HIV international and community forums. You had a low to zero risk exposure, symtoms that did not suggest a new HIV infection, and negative tests that confirm you don't have HIV. To your specific questions:
1) Your negative test results are conclusive for all the sexual exposures described. In contrast to common advice about testing at 3 months, in fact 6-8 weeks usually is sufficient; here is a thread that discusses it:
http://www.medhelp.org/posts/HIV-Prevention/-A-Question-on-Testing/show/1347755
3) Your last partner's negative test plus use of condom proves you were not at risk. For that reason, plus the reason above, you don't need any more HIV testing at this time.
2,4,5) Weakly false positive results are fairly common with the rapid tests, which is why lab-based tests are preferred unless an immediate answer is especially important. Your later negative ELISA proves the rapid test was wrong; if the weakly positive rapid test were true, the ELISA would have detected antibodies. The reasons the rapid tests sometimes give false positive or indeterminate results are unknown, but there are no known health implications. The important thing for the future is that you avoid rapid tests if and when you need future HIV testing.
So congratulations; all is well. I hope these comments are helpful--
HHH, MD