Someone told my mother about being the victim of CSA, said she demands I take a lie detector test

I don't want to go in-depth regarding the CSA I experienced at the hands of her ex-boyfriend while I was a child, but I'll just summarise by saying the actions he did caused me a lot of emotional pain and I still struggle to form intimate relationships with others.

My mother found out about the CSA I experienced twenty years ago when I was a child, and her immediate reaction was to demand that her ex-boyfriend (who she still has contact with) and I take a lie detector test to see if any of us are lying. Where I live, the lie detector tests are not used for cases relating to sexual abuse as the lie detector tests are more used if it's easier to "prove or disprove" i.e. if someone stole something.

Because of medication that I take it means that I would be unable to take a lie detector test. She was demanding that I stop taking medication (which helps a lot with my depression and anxiety) so I can prove that I really was abused.

It hurts that a relative told her my private business before I was ready to tell her, and it hurts I need to relive pain that happened twenty years ago and I have no proper support system.