Exhausted.

My mom suffered a serious cardiac episode nearly 2 years ago. Her recovery has been lengthy. She luves alone in her own home but I am an only child and her primary support. She walks with a walker, has occasional falls and is currently unable to drive. I work full time and live across town with my domestic partner. She requires frequent emotional support in addition to support with chores and errands. She is also a heavy drinker. She has always had high demands of me and it has become more intense these past 2 years. I love her so much and empathize hugely but I am beginning to feel very resentful and exhausted. She refuses to use community supports that may be available with the exception of accessible public transit... but only to and from work 3 days per week, the rest often falls to my partner and I as I am an only child and he drives while I do not. The guilt/resentment cycle is taking it's toll emotionally and physically. Any words of support or wisdom would be appreciated here.