I have watery diarrhea (passed fresh blood once), stomach growling, excessive gas inc eggy burps, vomiting, appetite loss, sharp stomach cramps?

Diarrhea: May be gastroenteritis. ,bacterial or viral that could resolve in 1 week. Try probiotic. The concern is that with blood may be E coli 0157:H7 that is associated with hemolytic uremic syndrome so bactrim in particular is not recommended- the impact of other antibiotics in unclear. if having > 6 movements a day would lf/u/ w/ ER/ doc as will get dehydrated.