It started in July while on vacation in Italy. I was urinating and it looked like the color of red wine. it lasted for 4 or 5 days. I have had 3 more episodes like this. I went to the dr the other day and there is no infection in my urine, just lots of blood. I'm having a renal ultrasound on Wednesday and also seeing a urologist on the same day. They are looking at my kidneys. What can this be?