Just an update for everyone - went to the gum clinic today and had an oral swab, and talked to the doctor who was superb and really calmed me down about HIV. Said my mouth was perfectly normal, and my neck ache was muscular tension.
Anyway, all this worry about HIV got me wondering, so I've had a check up anyway. I caught chlamydia when I was younger and worry now about what else could have been passed, although the doctor was re-assuring and said it was highly unlikely and the chances in the UK of catching HIV from an under 25 is 1 in 10,000, where Chlamydia is 1 in 10.
Anyway, results day is the 21st, and its my birthday on the 22nd. I know i'll be really worried until then, but hopefully will be ok