I have had watery diarrhea for 2 days, there is almost nothing solid. i have had colitis in the past but the symptoms feel completely different. ?

Diarrhea: There are many potential causes for this. One of the more common is viral infection with agents like norwalk, rotovirus, etc. Of course, clostridium difficile is also a worry. Would wait a few days and if this does not clear see a doctor. In the interim stay well hydrated. The term "colitis" simply means inflammation of the colon (large bowel) and does not address the cause. Good luck.