bad stomach and back pain at night

I have bad stomach upper and middle mostley right side area and lower back pain mostley at night when I lay down. I wake up every night with pain it hurts to take a breath and it helps to sit up but the pain never goes away. I have had sonos, ct scans mri and xrays just got over kidney stones last month however dr said no more stones on ct scan. so she doesnt know whats causing the pain told me to get my gall bladder checked, however another dr said if it was my gall bladder it would have shown up on scans??i'm at a loss.i have all the symptoms of ovarian cancer so Im going to gyno this thursday but Ive had this so long I dont think its that