In my experience, it is beneficial when used in conjunction with physical therapy. There seems to be better mobility of tissues and longer lasting results from the therapy itself. Unlike other muscles relaxants (ie Robaxin, Skelaxin, Flexeril, etc.), they know how Diazepam precisely works on the brain. For TOS, I feel it not only provides a muscle relaxant property, but diminishes neuro pain. It also has a longer life than other Benzo derivatives, which can enable you to skip a dose and you're not curled up in a corner in the fetal position shaking.

I've been on Diazepam for 2 years. I have never built up a tolerance and have only decreased my dosage with the help of manual physical therapy. Serious Benzo problems come as there are idiot Doctors our there who do not know or fail to inform their patients you can't stop this medication cold turkey. It can be life threatening! Telling you to taper down slowly is not enough either. Your idea of slow vs the drugs idea of slow may be two different things. Due to being a long life drug, you may feel fine after tapering and stopping, but withdrawals may come weeks later.

I was placed on Diazepam without full disclosure and knowledge of the drug. In retrospect, I wish I had more information about the drug to have made a more informed decision, but the reward for me has been greater than the risk. It sounds to be beneficial to you as well with physical therapy. Best of luck in your continuing progress.