Took Dulcolax.8hrs later had the cramps & passed bm. But got extremely nauseous- 5min later vomited. Is itFrom the laxative? Still nauseous 2hrs later

Possibly. Dulcolax, by mouth, is a potent laxative and may have precipitated the nausea along with the abdominal cramping and bowel movements. I would be more concerned if you have associated vomiting or abdominal pain and tenderness. Ginger or flat ginger ale helps relieve nausea. See your physician if nausea persists.