This type of neglect happens EVERY DAY here in America... NOW!
Don’t stay in a hospital unless you MUST; and have a family member present with you at ALL times! Document every visit by staff, every med given, EVERYTHING.
People that do the above are cared for better, because staff know that someone is watching and taking notes.
My son and his wife are both RNs. They will NOT allow any member of their family to be alone in the hospital - not even the hospital in which they work(ed)(my son was severely injured on active duty and can no longer do the physical work of nursing). My daughtger-in-law checked out of work to stay with my daughter rather than leave my daughter alone.