Hello MsRrio,
I also worry about being a burden. My poor mom is taking care of my dad with Parkinson's disease and me with traumatic brain injury. I like you feel bad about it all the time.
What I do is I help with housework when I can. I take breaks often but manage to do laundry, clean bathroom, keep my rooms clean. I try to get the pressure off her by being home with my dad and looking after him while my mom gets away and goes shopping or to lunch with her sister and friends.
Just try to do some small thing each day that helps like a few loads of laundry or if your feeling especially good the dishes. You need to get your kids to help more. Have them take out garbage and do anything they can do.
If you have a day or some days when you can't do anything. Don't worry about it so much. Lower your standards. I know it is hard but everything does not have to be all done and clean all the time. Do what you can and don't worry about the rest. There are some activities that your husband is doing that he could cut out. Like the sports coaching etc. He may be dealing with it just fine and it is just you worried about it. Have you asked him?
Hang in there. I know it is hard having to be on the sidelines when your used to doing it all. Remember lower expectations.
Brain