I too understand what your going through as I am sure most everyone on the site go through it also.
Mikes advice is great as I too do much of what he says he does

When my RSD gets to the point I cant handle it and none of my meds work and the breathing and relaxation doest work .I end up going to the ER. Iam lucky enough to have a wonderful hospital where my pain doctor is head of pain managment there so every ER doc and nurse know him and by now know me. He has set a protocal for me and every RSD patient he treats on the meds to use. and for me at a certain point if that too doesnt work they admit me, usually to the ICU as they put me on ketamine, and lidocain 24/7 as well as my normal pain meds but they give IV until I feel I can get off the ketamine and lidocain then I am moved to a normal room and given my IV meds until I could go home. The only reason I have to go to the ER with these flare is if not with my RSD internal if I dont get help quick enough my bladder, and stomach shut down and my blood pressure and pulse could become too dangerously high.
I know not all ER's or hospitals are like the one I use as I have probably been to over 33 in 7 states and more then half are pretty bad with treating RSD patients. So I do know ERs and hospitals arents always the easiest way to go.
I do wish you the, best and hoe your pain calms down soon, my thoughts and best wishes are with you!

Niki1