I would like to welcome you to Neurotalk. This site is filled with lots of information and lots of great people, who will try and help guide you in the right direction.
I am sorry to hear about Zach's dilemina with the Dr.'s and his diagnosis of RSD. I would recommend that you not only get a new podiatrist but also get a new pain managment dr. as soon as possible. Early treatment is essential in RSD, especially with the chance of remission. If you are unsure as to what dr.'s take your insurance you can also call the insurance company and ask them.
If they have noone that will do the injections ask them about filling an appeal.
Therapy is hard. Make sure they "DO NOT USE ICE", also it is important for him to continue to go and work with an experienced therapist.

Well welcome to the forum, I hope this information helps.