how long have you had the problem, it could just be cold virus, but with blood in the urine i would advise you going to see a doctor, sometimes masterbating can cause blood in urine (trauma), is the blood dissolved into the urine or is it in lumps or threaRAB, try paracetamol and/or aspirin (read labels on each medicines) if it gets worse go see a doctor just in case its a kidney infection, have you slept with any new sex partners, if so go for std check-up