Hello,
I hope the blood tests that you had included 'other' STDs apart from
retrovirus serology, and if NO then to put your mind at rest, you ought to get the serological tests done to exclude a STD.
HIV antibody test would be appropriate now given the time frame, but if you have had another encounter, then a HIV
RNA PCR would be the most sensitive test.
You must always practice safe sex in the future.
As for the muscle aches and
rash, there could be a few more differential diagnosis, but a blood test for complete hemogram, LFTs, CK levels,
TSH, ANA profile should exclude serious pathology if all are normal.
Best Wishes.