My advice is that you should take it easy. I was going through a bad slump, injured my ankle, had to finish the semester at school, was taking driver's education classes, and it really took my will to train for a while. I just couldn't manage to jump back in. So what I did was just trying to attend the days where there was just rolling, avoid the physical preparation days for a while, and take it easy as a whole until I felt safe about my ankle, about myself, and ready to go back to my regular schedule.
Also, remember that you can always quit. You're not bound to jiu jitsu, you don't have to be the AC/DC champion of the world, you don't have to hold the lightweight and heavyweight titles in the UFC, you don't have to do anything, especially when it comes to what you do on your free time with your money. Do what makes you happy. If jiu jitsu isn't making you happy at the moment, it's ok. You don't have to be psyched like crazy all of time.
My advice: bring the joy back to your training. Start small. Attend a couple of days where people just roll. Look up some dumb submissions on the internet and try them. Avoid heavy training days for the start. Test your body's integrity, injuries can make you really feel timid. Maybe buy some gear you really want to. It's your happy time, so take it easy and everything will come back.