for day or so. week or so later mouth ulcers. everything kinda went away over next few weeks. now 6 months later seem to be experienccing mouth sores again with what seems like ulcers on back of throat
ARS chances zero.
6 weeks to late? yes
Would ARS come on over 3 weeks or so? If one was to have ARS the would happen 2-4 weeks after infection, last 1-2 weeks and then be gone.
Could be possibly reiter's syndrome? See your doctor for a diagnosis.
Fever 6 months later has nothing to do with ARS.
White tongue does not mean thrush.
Symptoms or lack of symptoms means nothing. If you had unprotected vaginal sex then test. You can test now and get a conclusive result.