I'm having severe left-sided lower abdominal cramping spasming and it hurts very very bad?

R/O GASTROENTERITIS: R/O gastroenteritis/Diverticulitis 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 bacteria. Given your age a CT Scan may be needed to R/O appendicitis/diverticulitis. Lastly an endoscopy and colonoscopy if symptoms persist