Hi @almi319 and welcome to Mayo Clinic Connect. I can definitely relate to having a family member with a diagnosis that you feel is not being properly treated and feeling helpless to do anything about it. A family member of mine had a similar issue where the police were called and our family asked that they be involuntarily baker acted so that they can get they help they need.
I can tell you that 20 years on those medications can most certainly change the person's body chemistry.
Have you asked them if they are willing to check in to a facility to help with their symptoms?