Hi Thanks for posting on HCM With a past history of lactose intolerance, it may explain your present symptoms.However, other may conditions not related to lactose intolerance may be causing symptoms or aggrating your underlying condition.Possible causes may include: -Bacterial, viral or parasitic digestive infection -Food poisoning -Artificial sweeteners -Other digestive disorders like Crohn s disease, ulcerative colitis, celiac disease, microscopic colitis and irritable bowel syndrome. I will suggest you see the Doctor for a stool exam/culture In the meantime, i will advise you try the following: -Take oral rehydration salt to replenish fluid and ions losses -Zinc tablets to help in intestinal mucosa repair -Take an anti-diarrheal like imodium -Drink enough water to prevent dehydration -Avoid large servings of milk and other dairy products -Include small servings of dairy products in your regular meals -Eating and drinking lactose-reduced ice cream and milk -Drinking regular milk after you add a liquid or powder to it to break down the lactose. If these measures do not help you, you see a Gastrologist for evaluation. Hope this will help Wish you good health