Hi, I m a 25 year old male. Over the past few weeks I ve been noticing a slight pressure under my left rib, radiating into my stomach/goin. Just recently (and for the last few days) when I urinate it begins bloody, then it turns clear, then it drips blood. I have this weird tingling feeling under where my pubes are but the inside inside of my pelvis. Went to the dr and the gave me this Ceft something antibiotic shot in the but, and Azithromicin 2pills one day treatment. I m still peeing blood after 3 day, they called and told me my samples came back fine. They told me I didn t have and STDs and that I was fine and it was nothing serious... with given minor details I m concerned, I think I have kidney stones. I get these awful sharp pains that radiate through out my penis into my groin and lower abdomen. What could it be? How long will it take for the antibiotics to work?