About 6 months ago I began having issues with my semen. It started with me finding red blood spots mixed in. After a couple of weeks started to look brownish or rust-like. A month or so later, you could find yellow-ish chunks in it. As gross as that sounds. I went to see my urologist. He looked at me crazy, and sent me home with antibiotics. I finished the prescription and it seemed to go away. About 2 weeks ago, it started again. Now reddish semen, and seems to be more than normal. I am 31 with 3 healthy kids, and have had no other health conditions. I have had a vasectomy about a year and half ago. Please help. Starting to worry about this.