Yesterday while sleeping I feel a urge to pee but I hold it for 2-3 hours. In morning while peeing my bladder was hurting and brownish colour urine came out(I drank very less water on day before yesterday) It also contain 2-3 reddish-brown fibrous particles and I feel severe irritation and pain in urethra. After that I drank 3-4 glasses of water then me urine becomes clear and my irritation and pain is also reduced and no visible particles but at the last moments of peeing I feel a pain and irritation.I am very stressed. I also developed fever at evening. What to do.