Goodmorning brother,
I am brand new to this website. I wanted to respond from a sisters point of view and scriptural view.You are commanded to provide for your family and you are doing a great job Jehovah tells us thru his word the bible to do the best we can for our own personal circumstances your family needs you and your children need your spiritual guidance as much as the people in your territory if you burn out wich you are your circumstances have changed and you need the rest and to be the best father and husband and provider and spiritual head you can be to them, and fit you service time around your circumstances. Just my thoughts.:)
Sincerely,
your sister Brenda