Hi Sandy,
I really feel for you and what you are going through. I had hard times with my mum, from times when I was only six and she took an overdose(because of depression) and I had to be examined because medics thought that she had given me pills as well!! through to age 12 when I had the worst beating of my life(why did no one seem to know she was hitting me - I never told anyone because she always told me it was my fault and that I had to be "Smacked" as she called it - when you think it is your fault you believe that you deserve to be hit(sounds crazy I know) I was scared of my mum even in my twenties, then something just "clicked" and I realised none of it had been my fault and I did not deserve to be hit when I was younger. When I had my daughter and son, I vowed I would never once raise my hand to my children in any way shape or form and I never ever have - my kids are now mid and late teens and I have a fantastic relationship with them. Although I always kept in touch regularly with my mum and she used to stay with us every couple of weeks, all through my life she used to try and antagonise all the time by saying things mainly like how wonderful her friends children were to their mothers - compared to me!! - my mum had a hip replacement a few years ago and I nursed her for weeks at my house, helped her to the toilet, showered her and dressed her and she became meek, mild and grateful - then when she was better she returned back to her normal way "THEY SAY A LEOPARD NEVER CHANGES ITS SPOTS" - but you just bite your tongue, let her say her piece and let it not worry you. My mum passed away suddenly last year and through all her bad points, I still loved her, because she did have her good points as well - my mum did not have a very good childhood herself and maybe that is what made her the way she was.
So I know it is hard but try to remember you mums' good points and the happy times you have had with her as well cos one day she won't be there. xxxx