Hello it could be many of things a cyst, tumor or an infection i will go to the hospital if it doesn't ease up a bit. I hope you feel better good luck
The various possibilities which present with such pain in the lower left abdomen are appendicitis or diverticulitis, Crohn’s disease, bowel obstruction, ovarian cysts and pelvic inflammatory disease,irritable bowel syndrome , kidney obstruction or pyelonephritis, psoas abscess and volvolus (twisting of the sigmoid part of the large bowel on itself).
Investigations like ultrasound abdomen, CT abdomen and colonoscopy are required to confirm a diagnosis.
It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.