I got a chi machine for my all over discomfort ( low back/upperback, chronic repetitive strain injuries) & general overall wellness I guess you could say.

It feels good and there is an invigorating effect for me overall.
But I don't know that it would much for RSD or sarccoidosis.

I've read a lot about the Far Infrared saunas and portable hothouses.
I do have a far infrared heating pad and it does help for my problems better than a regular heating pad.