Welcome to the forum.
Almost the most consistent, unchanging advice on this forum is that as long as HIV testing is done sufficiently long after the last possible exposure (usually 4-8 weeks depending on what tests were done), the results ALWAYS overrule symptoms and exposure history. You could have had an exposure with the highest imaginable risk (e.g. receiving a transfusion of HIV infected blood) or very typical symptoms of ARS.
Therefore, your exposure (which actually is quite low risk, since it was heterosexual) and your symptoms (which in fact are not typical for ARS) don't matter. Your negative test results -- especially the last two tests at 8 and 10 weeks -- prove you didn't catch HIV. No additional testing is necessary.
I won't comment on other potential causes of your symptoms, except that many of them indeed are consistent your own suggestions of anxiety and alcohol withdrawal. But I can guarantee you they aren't caused by HIV.
That said, official advice from most health agencies recommends final testing at 3 months. If it makes you nervous to not go with that official recommendation, feel free to have a final test at 3 months. You can be sure it will remain negative. For further discussion of this, see the thread linked below as well as the other thread linked in that one:
http://www.medhelp.org/posts/show/1891685
Best regards-- HHH, MD