Hi Keb....I'm sorry the meds haven't been helpful to you.
The VNS or Vegas Nerve Stimulator was initially for folks who suffer from Epilepsy. I work with a woman who has a VNS implanted and it has been a godsend to her.
Since the brain functions both chemically and with electrical impulses, it sounds like the VNS would be a great choice for someone like you who is medication resistant in some way.
One of the things about the stimulator is that when it activates, it may make your voice sound different for a few seconds. It's nothing major and after awhile you probably won't even notice it. Every couple of years you will need to have the battery changed, but it's a minor procedure.
I wish you well and hope things work out for you!!
I also found this link that might be helpful to you -
http://www.depressiontreatmentnow.co...FRzmgAod2HmlNA
Hugsssssss
J