I deal with RSD and I find that the traditional avenues of confidence building help more than anything, such as being very fit and working out a lot. Developing genuine expertise at something is also very beneficial. Anything you can take pride in will help. I don’t think you’ll ever find a medication for RSD, because you need to address the reasons for your RSD, which are real.
The only times I’ve effectively diminished my RSD problems is when I’ve been confident about my appearance.