I have ongoing nausea and vomiting for 2 months, I can't eat anything what can be the cause?

Nausea/Vomiting. Nausea/vomiting may be gi-related (food poisoning, peptic disease, gastroparesis, due to biliary & pancreatic disease, gas/bloat syndrome, small bowel problems. Consider "central" causes: motion sickness, vertigo, migraine headache, brain problems (some very serious). Also, rule out infection (? Urinary tract), medication side effects, pregnancy, & even reaction to stress. See your doctor please.