question: My urine has been very foamy and it looks like a plastic film if I let it stay in the toilet for a while like an oily substance. My GP told me my last blood test had a gfr of 51. I've been also diagnosed with chronic prostititis as well. I take flomax and terazosin which helps me greatly to urinate. My prostate is always swollen. Could my prostitis be the cause of the urine change. I've increased my water intake with no changes other than the color being clearer.  kidneys hurting a little