I am not a doctor either but after reading your post I want to say I agree with Alt and Catra on this one.
Be careful about messing with meds. They may cause side affects you're not aware of. I imagine you've talked it over with your neurologist? If not you should before experimenting on your own.
As far as I know RSD has always given more than one symptom to everyone. There are other conditions that seem like RSD but in fact are not.
It sounds like your neurologist did enough testing to know. It's your body so communicate everything to him/her.
Best of luck and keep us informed...