I think there are times every mother wants to go on a vacation. Or sometimes even quit. So don't feel guilty for that, that's normal.
I'm sorry your son is going through all this, and dragging you along with the ride.
Personally what I would do is either tell him how I feel, let him go for awhile so he can figure out what he needs to do, or do both.
I hope it all works out for you, and for your son.