Why did i get horrible stomach cramps, excessive sweating & hot flashes that turned into cold chills & black watery diarrhea?

Concerning: Your symptoms are concerning for possible severe problems with your stomach or other gastrointestinal issues. The black stools suggest blood loss from your stomach (such as a bleeding ulcer for example) or elsewhere in your bowel. You need to see a physican asap and i typically would not suggest an er visit on this type of site but with your symptoms i suggest an er visit now. Good luck.