To say you are being torn in several pieces at once is rather an understatement. I'm so sorry this is such a rough time for you.
Frog of little brain's heart goes out to you.
I read through your post twice and came to the same conclusion both times.........take some time for yourself. Not daughters, not husband, not family just you and don't feel guilty doing it. You need to pamper yourself a little. Not next week, not tomorrow, now.....the sooner the better.
But then frogs of little brain are not known for their sage advice.