Hi there...
Welcome! First off, Mom just gave you very good advice. Second, amputation is just not an option. Many doctors think that RSD, mirror pain and phantom pain all happen for the same reason (whatever the reason is, they don't know that yet!) - get on the computer and look up "phantom pain". Bottom line is that chances are that even without your leg, you'll still have the RSD in the missing leg...weird, huh?!!
Having said that, have you tried nerve blocks? Just do a search on this forum, we have lots of information about that here, they have helped many people.
Hope you find something that works soon,
all the best