It's a very hard place to be, that's for sure. You are not alone - it has happened to many of use.
My mom was in nursing home in FL and they were talking of her possibly needing a long term care facility. My sister had passed that same year and there was no one to help take care of my mom. Brother worked down in the Keys for a gov't contractor. I figured a way to move her up here, and my BFF and I moved mountains to drive my mother and some of her things back up here and she transferred into a nursing home here in Calvert. I had NO idea she would get better - but I kid you not- she was "meeting all her goals" within 1 month and the nursing home released her! The day before Thanksgiving. I had NO options and about 1 week notice - so she had to come home with me. It was very difficult on my 2 sons and myself. I worked fulltime, had 1 teenage son, and 1 son who is developmentally disabled and still acts like a teenager and then mom was acting like one, as well. She was going to move to St. Mary's County to be close to the base and military health care. (Dad was retired) Never mind that I couldn't go back & forth from Prince Frederick to (wherever in ) St. Mary's County every time when she needed something or someone to take her someplace - which was nearly daily!
The nursing home "admins", her care workers, her social worker, whatever all their titles were - were OF NO HELP TO ME. The mindset was "she's an adult and entitled to make her own decisions". They didn't help sway her to stay in Calvert, they were not useful in leading me towards resources to help me. I was nearly on my own in every aspect. It was so frustrating. My only sibling was not always on the same page with me (my mom played him against me) and that made things even more difficult at times. Mom was even convinced she was going to get her MD Drivers License, again, too. Thank GOD her doctor told her he would not approve it!
I guess all of these little stories are to say that your mom IS an adult and she can make her own decisions. She wants to remain independent. Of course. The problem is you are her son and the roles are reversed, so it's not fun for either of you. The other major problem is - she also NEEDS you to assist her. She probably doesn't want to, but she does. I had to learn to pose things to my mom like this: "well, mom - if you are going to move to St. Mary's then you are going to have to figure out who is going to be helping you out over there. I have my job and the kids and I can't just drop things to run you over to the grocery store, or Walmart, etc. etc." I just had to keep saying and doing those kinds of things to get her to slow down on the plans to move. Her health continued to decline and she was in Hospice in a few months, as she had been diagnosed with an advanced form of cancer, which we didn't know about.
I understand what you're going through. If YOU have some support - a spouse, a group of friends, even a counselor for yourself. It will help. Good luck to you