No, it would not last only 2 days, and you would have been very ill - not like what you described, which sounds like a common virus.
Symptoms are not a good way to diagnose HIV as many people don't show any of them at all. If you had an encounter, the only accurate way to check if it resulted in an infection will be testing. Go for a duo/com ag/ab test 28 days after the exposure. The result will be accurate.
All the best.
38.5/38.8 C is not ARS fever, it's normal body temperature that varies during the day, it's your own diagnosis of constantly monitoring your own body. Symptoms do not mean any thing. If you think you have exposed yourself to HIV, you need to test at 4 weeks with a IV Gen HIV test or alternatively, at 6 week with any standard antibody test for a conclusive.
I am going to reiterate, 100.4 F (38 C) to 101.8 F (38.8 C) doesn't indicate emergency, it is not a 'bad fever' if it goes away by consuming paracetamol since it may not need treatment. High Fever is 102°F (38.9°C) or above which could be considered an emergency because it could lead to dehydration and may be a sign of infection.
You are not listening to any advice offered to you, Symptoms do not mean any thing, rephrasing the same question in different manner would not seek you any different answer.
In the last decade of this forum's existence, we must have seen at least a 1000+ people complaining about all the symptoms that book reads however at the end they've been running around with all the whoo-hoos!
No one can diagnose you online or otherwise, only testing can tell.
What was your exposure details?
People have sex all the time, not every unprotected act of sex means HIV contraction, What brings you to the conclusion of acquiring HIV from this unprotected incident?
If you are so anxious, why don't you go test your partner?
When was your exposure?
Give us details for a fair assessment, no one can discuss your situation with half information you have provided.
Once again, the fact of the matter remains intact here, If you think you have exposed yourself to HIV, you need to test at 4 weeks with a IV Gen HIV test or alternatively, at 6 week with any standard antibody test for a conclusive.