Please help asap!!!!?

I was at a music festival today for about 8 hours. At the start it was hot like 27 degrees then after a couple of hours it started raining. I was in short shorts and a singlet and thongs. I was completely drenched for like 5 or 6 hours and there was hardly any shelter at all and I was waiting for a lift so I was wet for quite a while. Was hugging another friend to keep warm but he was also wet. Coldest it got was maybe 12 or 13 degrees. I was also drinkin but I do remember being cold. Anyway, just before I threw up a little bit and now my throat keeps producing mucus. Well more like thick sort of saliva with a slight tinge to it rather than actual phlegm. I really wanna sleep. It's 7 am and I havent slept yet. I'm paranoid I may choke on the phlegm while im sleeping. Will go docs office but I wanna sleep for a bit. Should I sleep sitting up or?? Thanks heaps guys