I am 24 and had lower left side abdominal pain for 2 months and pelvic pain sharp shooting vaginal pains. bleeding between periods clear ultrasound?

Hard to say: Could be a hernia, but that wouldn't cause the irreg bleeding. If the sono showed no cysts, it could be endometriosis or possibly a sexually transmitted infection, if you have had an exposure. Hormonal imbalance could cause the irreg bleeding, but probably not the pains. A bladder condition called interstitial cystitis could cause the pain, but again, probably not the bleeding.