Drug Induced Parkinsonism can be reversed by removing the offending medication medication. If this doesn’t work it is if fact Parkinson’s. It may take a while for all of the medication to clear the system.

This is the best available link for DIP Parkinsonism. It lists the drugs that can cause this.

https://premierneurologycenter.com/blog/what-is....

https://www.myparkinsonsteam.com/resources/drug...

I doubt there are any specific support groups for drug induced Parkinson's as the numbers are small and the issues are similar to other forms of Parkinsonism.