Disasters come and go... in life and caking. I'm ready to quit all the time, usually every weekend. But when I think about entering the work force after being my on boss for over 17 years, ain't no way I'm punching a clock again. I like being my own boss. So after whatever goes wrong, design won't come together easy, cake icing not cooperating, somebody shows up 4 hours early and cake is not done, etc....after I get all the cakes out I take a nice long hot shower and chill.
Burn out is very common, so take some time off and relax. If or when you start back up don't take on too many cakes at once. Being overloaded is a recipe for disaster. If you have someone to help you delegate some jobs to them and don't try to do everything yourself. If your still struggling and are unhappy it may be time to pack it in. But only you can decide.
I hope it all works out for the best for you.