The encounter you describe is virtually no risk for acquiring any STD, including HIV. Your partner may have been of unknown status but as an ex-girlfriend, was not unknown to you and I presume there is nothing particularly worrisome about her such as being an IV drug user. Even if there was something risky about her that you know, the chance that she was infected is low, the chance of infection if your sex was unprotected is low likewise low (less than 1 infection per 1000 sex acts) and in your case, since a condom was used your risk is essentially zero. Statements by the CDC that there may be some risk from condom protected intercourse are overly conservative and reflect their need to never be wrong as a governmental agency who has to provide non-individualized information via the internet. Further, the symptoms you describe over the past two month may not be related to one another in any way and none of them are suggestive in any way of HIV or other STDs.
If you cannot shake your fear of HIV, you can get tested- it has now been 9 weeks since your exposure and, therefore an HIV antibody test will be completely reliable and accurate. I am confident that you did not get HIV form the exposure you mention.
As for the list of symptoms you mention, I cannot pull them together into any single specific medical problem. I suspect they may be unrelated and are at least in some instances may be things that you have noticed because of your concern and heightened awareness. If they are troublesome or problematic for you, you should have them evaluated by a medical professional who can do a complete history and physical examination..
I hope my comment is helpful. As I said, there is no reason to be worried about HIV. EWH
I'm pleased i could help. EWH