Hi there... you have acute gastritis.. abdominal pain, nausea,vomiting, bloating of abdomen, feeling full, loss of hunger, increased gastrocolic reflex(sensation of going to defecate everytime after having food) al these are symptoms of gastritis. Cause of it is stress, not having food on time, skipping meals, spicy foods, fried and canned foods, alcohol, smoking, tobacco chewing, tea,coffee, not sleeping on time. Al of these increase acid production in stomach and disruption of protective mucous layer in stomach and thus they cause inflammation of stomach..
Treatment includes lifestyle changes, sleep and eat on time, avoid stress, avoid spicy and sour foods, avoid smoking alcohol, have bland food, have cold milk, have frequent sips of cold water. If still pain persists then you can have tablet pantoprazole 40mg once or twice a day before food depending on your severity of symptoms.
Fresh Blood in stools could be due to tear in anus or due to bleeding ulcer in large intestine.. please consult surgeon soon..