Hello, a, We need to find out the reasons for the problem you are experiencing. If the diarrhea started after eating or drinking something contaminated, you could be suffering from food poisoning. Depending on the bacteria, symptoms can get better or worse on it s own. If you are having fever,chills, then you might need antibiotics. The reason you are not urinating much is because you are losing fluids in the stool, not drinking enough to replace the loss. You need to drink fluids that can replace electrolytes. Sports drinks like gatorade , ricelyte or pedialyte can help. You can lose sodium and potassium through lose stools. If the Imodium has not helped in four days, you do need to see a doctor. You need a stool sample tested for blood, have a stool culture to look for bacteria and then get appropriate antibiotics. If the diarrhea is caused by virus , that usually subside within 72 hours. Start taking some probiotics or eat plain yogurt a couple of tablespoons three to four times a day. Green tea is good.Once you can eat solids, stay on bland foods. Avoid too much caffeine, alcohol, spicy ,fatty or greasy foods for atleast a week or so. Hope you feel better soon.