Hello Tara and I thank you for posting your query here and I m definitely going to help you out. I am really sorry to hear this about your health. Welcome to HCM.. I being a surgeon, we encounter so many such cases day in and day out.. I read your question completely and have understood it well enough. I advise you to not to worry.. This is a real problem with so many registered cases. Please note the following few facts.. 1. Yes, vomiting and diarrhea is a bad problem to face but good thing is that, with proper treatment, improvement is good.. You need to be positive in your intent and not to worry.. 2. Coming to your symptoms, vomiting and watery diarrhea all day leads to electrolyte imbalance. Low sodium, potassium. And hence, this results in Cramps, lethargy, lack of energy as you have rightly described. 3. Yellow watery stool is a concern. You most probably will be having Infective diarrhea. Because, if it was food poisoning or something, you should have been fine in 1 to 2 days! 4. Don t worry, start on these tablets and follow other advise, you should be fine soon.. A. Drink lot of water, around 4 to 5 litre a day. B. Add, ORS, oral rehydration solution. This will replenish the lost electrolytes. C. Drink coconut water if you can.. D. Start Tablet Orni O, ornidazole and ofloxacin twice a day for 5 days after food. Tablet, Pantoprazole 40mg once a day, before breakfast for 5 to 7 days. You should be doing good with this treatment. Hope this helps you, in case you need any further assistance, please let me know. Take care and God bless.