What does it mean when i have random severe pain in my lower left abdomen? it's been going on for 3 months now.

Seek help: Since your symptoms have been present for several months now, it is unlikely to be a simple thing such as an infection/gastroenteritis etc. The causes of lower abdominal pain are too many. You need to have further workup, especially if also having any of the following: diarrhea, vomiting, weight loss, fevers, blood in stools. Please see your primary care doctor or a GI specialist.