If I've got this right, you have: Degenerative Disc Disease, Spinal Stenosis, Herniated Disc, Arthritis of the Spine, some kind of problem with the L5-S1 area, sciatica, diabetes, depression and anxiety.
And you are your mother's main caretaker? Sounds to me your mother, and you, would be better off if she were in assisted care. Sure, she'll be 20 minutes away, but during your visits you can enjoy each other, you won't be doing all the work. There will be an adjustment period, and yes, she may ask to go home periodically, but if you and the caretakers remind her often enough that this is her new home, she will adjust.
My father has been in assisted care for two years, 500 miles from me (near his wife). He was there a year before he said one day, "I've visited here long enough and am ready to go home now." When told this was his home now & he'd been there a year, he was astonished, but understood.
We are now in the process of moving him to my town, to a care home that will be 20 minutes away. Seems like next door compared to 500 miles away, where I have been flying down to visit regularly. His wife is getting frail herself and here my dad will have me & my three grown kids to visit & take him out, and his wife will come for visits periodically. We expect an adjustment period, but am sure it will work out fine.
If you are crying all the time, perhaps you need an adjustment to your depression/anxiety medications. You have done just great caring for your mom - now is time for the next step - which won't be any easier if you put it off more months or years. And my guess is you will be pleasantly surprised, if you get a quality care home, your mom will do very well, and you will be less stressed & happier.