I know what you mean about being stretched thin, not that my life is the same, but I am dealing with a husband with Alzheimer's Disease and vascular dementia who has been in a care center for over 2 years that is 45 miles from our home. I visit every other day. My youngest son, age 60, has been diagnosed with early Alzheimer's disease and although I don't have his direct care to be concerned with, it is still a concern and I try to help as much as possible. He is unable to work and is waiting for his SS disability to be approved. The government works very, very slowly and he has had to resubmit much paper work and jump through many hurdles with the help of his spouse. I hope this is approved soon. He has contacted our US Senators and has engaged an attorney but the wait is still hard. It shouldn't have to be this way.
I could go on but I won't burden you will all that has happened in the past year in my family. Almost too much. I almost want to say "If I didn't have bad luck, I'd have no luck at all".
Take one day at a time, and the suggestions made by others will help you through. Family and friends are useful at this time. Don't be afraid to ask them. They are just waiting for suggestions on how they might help.