Good luck on your mri. It is better to be safe then sorry. Rule out some issues. I am super suprised your neuro didn't have you get them.
I was on zoloft for a long time before the pn. It was a combo of zoloft and remeron. I too think they use it more often in teens which I was at the time. Cymbalta I know some have found to help in pain but for me it did nothing. I often wonder from the commercial if it is more the pain experience from depression it works with rather then the nerve pain that of course adds to depression. What works for one may not for another. So frustrating,a lot of trial and error,and of course the lovely side effects. Well good luck