Running this forum has been an education, for me, in human behavior and health psychology. What I have learned is that for some reason, personal reassurance is important to people even when the answer is obvious. ("Yes, all the other nearly identical situations really do apply to you as well.")
And they do. In your careful reading of the forum, you have seen that 1) any single episode of unprotected vaginal sex is low risk for HIV, unless there is specific evidence the partner was infected; 2) symptoms almost never are a reliable indicator of acute HIV infection, especially in low-risk situations; and you can predict that I will say you don't need HIV testing based on the exposure you describe.
The risk of unprotected vaginal sex indeed averages around 1 in 1000-2000, if one partner is infected. Your symptoms do not particularly suggest HIV. But if you remain nervous, or if you have had other potential risks (sex with other people) and haven't been tested in the past year, this would be a fine time to do it, if only for reassurance. You can count on a negative result.
Good luck-- HHH, MD
Symptoms mean nothing. If you read through this site or any other forum every poster has symptoms. You could probably get a test now and get a good idea but the doc will tell you the odds are low you have anything.