Sue for mental anguish/Or leave it alone.?

My Mother died in June. My Sister kept me from seeing our Mother by telling me that I was not allowed to call her meaning my Sisters house or come to her house to see my Mother. My Mother had a stroke in 2005 she was living with me at the time, But this Sister cause so much trouble with her jealous that I felt it better she go and live with this Sister because this young Sister had my Mother make her the exec of her will and power of attorney one day after she got out of ICU. unit. My Mom did go and live with her but after one month of mistreatment left her house to live with my Oldest Sister. However my Oldest Sister ped away. And since this young Sister had the power of Attorney my Mom had to go and live with her as her health and mind were failing since the 2005 stroke. In Nov of last year my Mom had another Stroke and my Sister only allowed me to see her because she wanted me to look after her as she could not be left alone at all and needed 24 hour care. Even thou there were other beds not used as her daughters my Sister had me sleep on the floor in my Mothers room even thou she knew that I have a neck injury that left me disabled. I tried to look after my Mom as best I could however if was very hard to change her with my Neck injury and was not able to change her as many times as my Sister demanded me to before she returned from work as she did not want to have to come home and do this. When I told her it was hard for me. She cut me off from seeing her anymore until my Mother was again in Hospital and dying. She was even fighting with the Doctor that did not agree with my Sister wishes on treatments she wanted such as stopping all medication example heart medication.stopped. She also would not take my Mother back home. My Sister was even fighting with me in the hospital and placed a photo of herself near my Mothers side table in herself Nursing Graduation outfit to try to intimidate staff. My Sister took a course for a RNA but did not stay working at that for more than about 3 Months after a little old lady in a Nursing home slapped her across the face she realized she did not like working with old people and it was not for her. My young Sister also made sure to convince my Mom in 2005 after one and a half day out of ICU when she took her to my sister own Lawyer I was left out of my Mother will. She also used my Mothers credit card charging items such as a new flat screen and hotel stays and applications for her daughters Univ and Her gym membership to Moms credit card as she knew my Mom had Credit card protection and it would be paid after her death some charges were days before my Moms death. My Sister has got away with all this and really no one seems to really care except me as this is still eating at me as my Mothers birthday would be this Month on the 23 it seems to just bring all this back to hurt my Heart. Has anyone experienced anything like this that can give me their opinion