Freaking Out!!

So, for the past 7 weeks I have been bleeding/spotting and the doctor don't even know why. I have gone for multiple ultrasounds and everything checks out besides my uterus being large for not having kids and my right ovary is 3mm smaller than my left. Oh, they also found an unidentified structure toward the back of my uterus that was casting a shadow by my right ovary. I have immense pain on my left side that shoots from my front to my back where my kidneys are, and every so often, my right side will hurt. Last night I was in tears from the pain! I have a MRI that I'm waiting to schedule because of my insurance. I'm scared out of my wits and of course, I am fearing the worst.