<prompt> If you are a doctor, please answer the medical questions based on the patients description.I have a headache that started last night after I had dinner - I had fish which was in fridge still in package, however it was thawed out from frozen over a week. Today I have a fever, which is better with cold showers and advil. I woke this morning and had normal breakfast, and was able to go to church and grocery shopping, but feel horrible again now, have been also going to the bathroom, trying to drink lots of water. no vomiting, but feel tired and no energy.  <response>: Hello, thank you for posting your question here. You seem to have a viral illness going on, with the headache, fever and loose stools. I would suggest the following:1. Continue taking fluids for the loose stools, make sure you have some electrolyte-rich ORS also2. Zinc for 14 days will reduce the duration of diarrhoea3. Paracetamol for the fever and headache. You should feel better in 2 or 3 days, once your immune system recovers from the virus. Keep having fluids and small amounts of food throughout the day to keep your energy levels up. Get well soon ! 