Ive vomited about 5 times, and 2 runny loose motions. after the third vomit, there was a severe pain in my back. i have not been able to sleep all nig?

Go to the hospital: You may have a ruptured esophagus. Please go see a doctor right away.

R/O GASTROENTERITIS: R/O gastroenteritis with severity of symptoms you are very dehydrated, please seek ER eval.. If symptoms persist you need to be examined and have labs checked and stool for H pylori the ulcer causing bacteriaTFTS/B12/VITD/Folic Acid. Given your age an endoscopy and colonoscopy of symptoms persist