Can you talk to your principal and see if there's any way you can simplify your workload? He may be able/willing to take you off committees, require less planning - like more basic lesson plans, or give you some type of aide (ie - send volunteers your way). Etc.

Also, if you return, be prepared to lower your expectations for yourself. You may be an awesome teacher who needs to be more basic and "boring" for awhile in order to become an awesome teacher again in the future.

You might also tap into your fellow teachers as a support group. If you had someone you could go to when you're feeling overwhelmed or had someone who would be willing to share resources or lend a hand every now and then, it might help.

Simplify, simplify, simplify.