It sounds like you are overwhelmed by all that is expected of you and feel like you will let your children and others down if you can't live up to expectations.
You will drive yourself into the ground trying to please everyone and end up worse. You have to operate within the limits of your capablities and let others know what you can do and cannot do. You are thoughtful and trying hard, that should be obvious to those that are close to. If they care and I am sure they do they will understand if you let them know.