In all probability the symptoms are due to alcoholic
pancreatitis and hepatitis. It can also be food poisoning. Take an OTC lactobacillus preparation and yoghurt with your meals. Drink plenty of fluids. Eat light, do not stay hungry but eat simple things like toast, porridge, cereals, crackers, banana, rice, peeled apple, etc. Take ORS. Take over the counter antacid and antiemetic (this SOS for vomiting). Consult a doctor immediately.
Take care!