Any unprotected penetrative intercourse involves a risk of HIV infection. This risk would be increased if there is also another concomitant infection, like in your case Chlamydia. Chlamydia can cause inflamed lymph nodes in the groin area, so that is easily explained. Your negative HIV test at two weeks cannot be considered conclusive as it is too soon. If this gentleman's HIV test was inconclusive, he needs to have it repeated. If he is positive, there is an obvious risk for you. However, even this being the case, the risk is always much lower for the bottom person than for the top. Also if you are circumcised, the risk of HIV infection is less. Stools do not transmit HIV.
In summary, I do not think you should be concerned, but you should not ignore the fact that there was an element of risk and you should have a HIV Duo test after four weeks of the incident.
....... "However, even this being the case, the risk is always much lower for the bottom person than for the top"
I thought it was the other way round ?????
yes, i think that was an error, transmission is easier from top to bottom, thats, the bottom is more at risk, in other words the receiver is at a greater risk. The receiver may be anal or vaginal, the giver is the penial. In oral its a bit different the receiver is penial and the giver is the one with the mouth, also in oral the insertive is the penial the receptive is the mouth.
Ya some of these gets a bit twisted up. The BOTTOM LINE IS THAT THE BOTTOM IS AT A GREATER RISK THAN THE TOP...