Everything I eat or drink makes my stomachr hurt so bad have terrible bathroom issuers makes me nauseous and my lower back hurt bad what can it be?

Could be multiple. Could be multiple things. Could just be a virus or a stomach ulcer or more. Would need further work up by your physician to be certain.
Go see your doctor. Not sure what you mean by "bathroom issuers" but "stomach" pain associated w/solids & liquids could be due to gastritis or ulcer. Low back pain might be coincidental. However, back pain is also linked to kidney infection which could make you nauseated & cause abdominal pain ("stomach" region is rather vague as stomach is really an organ while "abdomen" refers to all that area below ribcage).