I have tried Welbutrin twice and got the same side effects as you. However as you said you are now on pain meds which may help hold back the anxiety.
My physician put me on Buspar for the anxiety when she started me on the Welbutrin. The Buspar works fine alone but truly did not help with the Welbutrin for me.
I hope you finad a good combo.
I have read a bit about the magnetic stimulation but no really experience to give you on that topic. Sorry.