Anon as I still feel a little uncomfortable talking about it and don't want people to think i'm trying to out-do them with my story or anything. I got it in 2003 when I was 15, I lost 2.5 stone and spent a year pretty much without leaving the house apart from to go to the Dr's though they were never sure if I got something THEN got GF (as my initial and ongoing symptom was headache) or if it was a post viral thing.
I pretty much lost 2 years of my life (I went back to school the next year but only had 50% attendace so I spent every second I could studying as I was trying to get the grades into med school) I was in constant severe pain, had a tendency to pass out/nearly pass out, I spent at least 4 days a month vomiting uncontrollably. In that 2 years I had 2 MRI's, 2CT's, took all sorts of meds (tramadol, diclofenac, various migraine meds, epilepsy meds and steroids to name a few) and was passed around paeds, neurology, endocrinology (also had adrenal insufficiency), ent, my gp and consultant as they searched for the source of the headaches. So thats my GF story...there's no certainty over whether it was from GF or not as definite answers could not be found but if it was then yeah GF sucks, I know people who had it for about 2 weeks-why did I have to be the freak heh.
OP I would leave off the booze until you feel a bit more yourself.