WRAS,
This sandwich generation thing is not for the faint of heart...I hear you.
Having both aging parents...as well as spouse/kids/work...all demanding your care and attention...
...what does that leave for you?
Do your best to carve out time for yourself. Try to do something that makes YOU feel good...so you don't get 'lost' among all the directions you are being pulled.
Sending thoughts of strength your way!