Overnight I've gotten a really nasty stomach bug. I've been sick twice in the past hour and the other end is also pretty nasty

Basically is there anything I can do to get rid of this quicker or just make myself feel less ill? I've tried eating some dry toast, but I couldnt keep it down. I'm also pretty worried because I'm on antibiotics for tonsilitis and anti-depressants, and I was sick shortly after taking them this morning. Help?
EDIT: I've just read the leaflet for my antibiotics and it says some of the side effects can be vimiting and diarrhoea and if this happens to stop taking the tablets. Anyone have any idea how long these effects are gonna last?