Wow, I would be exhausted too,  What a demanding woman.  She needs to see a psychiatrist and recieve therapy.  I know another appointment.  But hopefully they could help you come up with some coping strategies.  You could actually have family meetings and set up a contract.  You made need to do some tough love.  If she doesn;t limit appointments she needs to go to nursing home.  That is very hard even when its your own mother.  I would definately go with a psychiatrist and therapy.  Thinking of you you need a solution ASAP