You definitely need to see a gynecologist. Please don't ignore this. If you have a cyst and if it is doing something like twisting a fallopian tube, your life could be in danger. Not trying to be over-dramatic, but ignored pains don't just go away. At least find out what is causing this pain and get treatment if something is found.
I was and am still having pain on my left side as well so i went to the doc and he sent me to the GI doc and he found pre cancer on a couple of areas in my colon by colonoscopy. there are other things specifically on the left side you can think about other than the ovaries. I have intestinal, colon, ovarian, uterin, and fillopian tube issues and I got all of it checked out. Yes listen to us dont ignore pain. Pain is there for a reason. To tell your body there is something going on. Good luck and I hope you get it fixed whatever it may be.