Oh dear Sweet, every caregiver wants to run away so you surely are far from being alone, feeling that way.
You may want to visit some "Caregiver" websites for support and learn how the Caregiver must Care for themselves.
It can be done, but we must also trust that our God would never lay more on us than what He Knows that we can handle With Him.
I know you're young but caring for our parents is something that your conscience will Never regret that you have done.
They have no one else and that is in it's own right, very pitiful.
I care for my 96 y.o. Dad and I'm not the healthiest person but I know this is undoubtably His perfect Will for my life. Somedays I come home and think my brain is going to bust open from the stress - but His Mercies are New Every Morning and I have the strength to go back and do more than I thought I could. The Lord provides times of rest and coming here is my time away from constantly having him on my mind. Today my Brother with the ALS has taken Dad out and that's another God send. Those are the days when I can completely let go of worrying about how Dad's doing cuz I know he's safe and protected being with my Brother & SIL.
It's not that Dad & I were close when I was growing up. I only lived with him & step-mom from about 13 to 20 yrs old ... around 7 yrs -- but The Lord has put such a protective spirit in me, that I feel like a lioness protecting her cub. His health comes first and his safety and despite that his illness has robbed who he once was - the Lord just keeps renewing this strong desire in me to Protect beyond all costs.
I pray for you dear Sis and will continue to lift you & your Mom up to Him.
I pray you find relief and breaks and things to enjoy [like this forum] and a day out or just to yourself & ways to be refreshed.
The Lord Will Bless you for what you are doing ~ Amen!
Hugs & Love from your fellow laborer in Christ. 
