Hey Alison,
Welcome!!
I just wanted to say that LOTS of people that are younger get better from RSD and go into remission pretty quickly! I have had RSD since I was 16 and I know alot of people who are younger who have gone into remission and recovered from RSD - so keep cheerful (if you can!) there is hope! If you want a message board which has a larger amount of younger people (these guys are great! but sometimes you might have concerns which are better dealt with by people more your age) then...
http://shsskip.swan.ac.uk/
and it has a yahoo group.
I really hope that you get better soon and that you get things sorted. I hope the breathing gets better - do you think it is in relation to the pain?
Sending you love and hugs and hope
Frogga xxxxxx