Lori, I'm so sorry this is happening.
I know it's hard to think this way when you're drowning in it, but: to whom can you apply for help in caring for your mother? You need at the very least a part time LPN to come and give her meds, keep her clean, and deal with other needs. At least.
I think you should make room in the day for a phone call to a social service agency for the disabled or elderly (probably county-level, I am guessing) and find out who offers help of this kind, and start the process. Maybe your mother's primary care doctor can refer you to the right agency.
This should be framed to them as an emergency situation because your dad is in the hospital and can no longer serve as caregiver. But it sounds as though, if she's not able to get up when she should, his caregiving was already not enough to meet the need.
I know it's hard to make that kind of call, but this falls in the category of "put your own oxygen mask on first"-- get more help in place so you can breathe and assess the situation without panic.
Best wishes,
DeeDee
