question: yes i recently was moving some 100lb propane tanks and the next day I started hurting real bad in my back. I was worried about kidney stones/infection...It hurts so bad i can hardly move at times. I do not have any trouble urinating or anything. However i went to the doctor this morning and he felt around on my back and said he could feel the spasms and said he was pretty sure that it was a pulled muscle, however he done urine test and said that they was a small streak of blood in my urine said it could be due to drinking alot of pop. can anyone help me out here??