It sounds like you have a urine infection. I had the same thing recently. The best thing to do is to drink LOTS of water, and you should feel the burning going down. If your back starts to hurt it means things are getting worse but don't worry just drink plenty of water and maybe mix some aloe vera extract with it, and visit your GP as soon as possible who will take your urine sample and prescribe some medicine for you. Hope you feel better x