Hi All, I've had an incredible recovery over the past year from lower back pain and RSI. I was disabled to the point that I couldn't use the computer for more than 10 minutes and sit down for more than 20 minutes without long lasting pain. Now I can use the computer / sit down for pretty much as long as I want with minimal issues. However, now I feel like I might be dealing with a new symptom - tension in my upper back muscles. Its like all my upper back muscles are squeezing each other and I just need to stretch them, but I can't. It comes after I've been working for a long time (maybe like 3 or 4 12 hour days in a row). I'm thinking it might be anxiety related as well. Sometimes it becomes hard to take in deep breaths. My anxiety has increased since after going through the recovery process in comparison to before. Has anyone experienced a similar symptom?