It is likely to have occurred due to gastritis or due to intake of iron supplements. I would advise you to do a stool examination to have a better idea of the stools. You will require antacids to control the situation. These following steps may help: - Don't skip meals, you may not feel like eating but in such conditions you should have the reduced amount in frequent intervals(i.e. 3 square meals broken down to 5 or 6 as you can tolerate) and slowly increase as you get better. - Reduce/ Avoid spicy,fried, fatty, junk and oily food - Avoid/ Limit drinking coffee, tea and carbonated drinks to once a day - Exercise regularly - Increase daily intake of water to 3liters - Avoid/Stop smoking and drinking - Reduce stress through methods such as yoga/meditation. - Avoid painkillers as it will increase your gastric problems at this moment.