There are some older posts mentioning Stoxen, you can use the search link in my siggy line to find posts.

On the massage thing- massage assist that is on his website.. most of the places those w/TOS need massaged is our upper backs and other hard to reach areas..plus the holding and reaching needed to use the massager could send us into spasms..


I doubt a single "tool" like that can "fix" TOS all by itself.
Often we do need an expert of some sort to do the hands on therapy..at least at first.

You should be able to find an expert & knowledgeable chiropractor, bodyworker or physical therapist in your area or a nearby large city.
It may take many phone calls, and web searches and asking questions , but they are out there.