Oh the joys of Brazilian Jiu Jitsu as a blue belt. :) I feel similar from time to time. My back will act up (be painful as fuck) fairly frequently which will have me miss class for a week or 2 at a time but what helps me to stay "active" is to watch videos. I know that can sound like a cop out but I'm a member of a group called Hidden Jiu Jitsu which was created by Rickson's 3rd ever black belt in the states, Henry Akins, and by watching at least 15 minutes of his stuff daily when I'm not able to train and even when I am it helps to keep me motivated and engaged even while off the mats.