Hi whenever i eat any kind of dairy food, i have an upset tummy afterwards and also any kind of stress causes cramps and upset tummy too?

Lactose intolerance: Lactose intolerance is common--25% of caucasians, 80% of afro-americans, almost 100% asians. Lactose intolerance can be secondary to lactase enzyme deficiency, or due to a bigger problem of small bowel inflammation, infection, infiltrative disease, and/or maldigestion. Don't assume its lactose intolerance unless tested, or at least assessed response to lactase enzyme. You may have ibs as well.

Lactose intolerance?: This is the obvious first guess and your physician knows how to test you. If emotional / physical stress causes similar problems, perhaps you also have functional bowel syndrome. There are way to manage this that work fairly well. In the absence of other symptoms / signs, an extensive workup might not be required. Best wishes.