I don't know what to tell you about the ortho appt- he was recommended by your mom & sis right?
Does he look at the " whole picture" or only focus on "bones, tendons etc" I guess that is a good question to ask them.

With the other doc mentioning muscular dysfunction is getting closer - as long as he doesn't just assume strengthening is always the answer.

With TOS, {and some other conditions},
it's the nerves and blood flow that can mess up the muscles by sending bad signals and on/off blood flow. It also seems to clog up/slow down the lymph system at times too. Puffy and sore arm pits are a give away for me esp when I over do.