I am banned from seeing my parent. She resides in a nursing home. I need advice.

My parent has been a resident of a nursing home for several years.
I have banned from seeing my parent.
I have several health problems and did not feel I should be her POA. My other 2 siblings are the power of attorney.
I was not told I was banned until after the nursing home staff assaulted me when I was bringing lunch to my mother. I made the mistake of telling a sibling I was going to bring lunch. She told the nursing home staff that I was going there to make trouble.
I don’t know why she did it but as a result I ended up in the Emergency Room. I just pulled in I got out of my car they had the door blocked and said
I have to use the other entrance. I walked to the other entrance and was
grabbed by a 300 pound employee and then I was grabbed by another employee who twisted my arms behind my back. I screamed in pain and told him I was disabled he finally let me go. The Administrator knew I was disabled and just watched from a far as I was assaulted. The police did not help.
The nursing home lied to the police. I was never told I was banned until after I got assaulted. My mother has some dementia and afraid she will be sent to another nursing home. The police did nothing and the nursing home lied and said my parent did not want to see me which was a lie. My sister knew I
was disabled she just lied to them.
Why I don’t know why. My brother is no help he is just a jerk. The nursing home administrator is a bully he knew I was disabled but was ok with his staff assaulting me. He is a bully he will have his staff try to intimidate you. They come in packs to intimidate you. He completely lied to my parent and said I assaulted his staff. I am not strong I am weak due to my many health problems.
It would kill my mother if she had to be sent elsewhere. The staff has threatened to send here elsewhere.
It is a nice place but the Senior Staff are bullies and if you complain about
anything they will find a way to hurt you and then ban you. I have read that nursing homes can lose their Medicare and Medicaid funding if they try to ban visitors. That residents have the right to see whoever they want. They are liars and they blackmail you. My siblings are no help and my sister has set me up for violence in the past. I haven’t seen my parent for almost a year. The coronavirus is completely separate.
This happened before the virus started. There staff can be very mean. I have been on the phone with my parent and I can hear her asking to go to the bathroom and the staff refuse. It is a conspiracy and being sick does not help. These people are horrible. I would think this could be considered Elder Abuse to have staff lie to my parent and they lied to the police. It can be Elder Abuse if siblings are also trying to limit or ban you from seeing your parent. They just want her there they really don’t care what happens to her. It is a horrible situation and you are powerless because they will threaten to have my parent transferred ans my parent is afraid it will happen. Have no clue. I have  thought about going to the Department of health or going to the nursing board because the DON does not do anything even if the staff are neglecting my parent. I have no clue what to do. I don’t want to try to go there and get assaulted again.
I do not know what to do.