I have left flank pain that started mid last year that continues. The flank pain comes and goes but is worst when I am lying down. I ve seen a Dr. who referred me to a urologist. The urologist had me do a cat scan, get blood and urininalysis work done and I ve had an ultrasound but there was no diagnosis. Just prior to flank pain occuring, in case it s relevant, I went to the emergency room thinking I was having a heart attack but there was nothing found. Recently, in the last week, I have a fullness in my upper left stomach area. There is no pain, only a sense of fullness.