Not exactly sure how it happened but this weekend I woke up with a sharp pain in my back which made it very difficult to even move around much. I went to the chiropractor the next day and it turned out to be a big knot in my back and in my neck. He ended up working on those spots and loosened my back but now my neck and upper back muscles have been sore the last few days. I commute to work 5 days a week 20 miles a day on my fixed gear and have been unable to this week due to the pain. I'm guessing it's the fit of my bike (didn't get it professionally fitted) but am not sure what caused it. Has anyone else experienced this before? If so about how long did it take until you could ride again?