I m experiencing water diarrhea about every hour, stomach pain, headache, lightheaded, dizziness, constantly tired and exhausted, abdominal pain when sneezing and coughing, constantly nauseous, mucus in throat and mouth is always dry, have been experiencing these symptoms for about 3 days. Should I see a doctor or is this just the flu? (recently had appendectomy, went to follow up appointment and everything was fine)