Hi there
Definitely seek medical advice, especially about the rash, but - I am assuming you are a woman otherwise ignore the rest of my post! - are you pre-menstural?
It's just that all the symptoms you mentioned are how I feel 4 to 5 days before my period. Bad hair, headache, night sweats. It's just a thought - however I would either contact NHS Direct or see your Doctor . And I kinow what you mean about feeling as if you almost live there. That's been me as well for the past year (some valid, some just hypochondria) but you are obviously worried and maybe they can put your mind at rest. Hope so
And hope you feel better soon