I know how you feel. I tried Cymbalta once and stopped after 2 days. I slept for 12 hrs. And then couldn't actually "wake up" during the day ! Now I just couldn't deal with that. The only good thing about it was I didn't feel pain while I was sleeping. But I didn't want to use it as a pain med.

I just recently had a really bad experience with Effexor. Holy s*** ! I was shaking , sweating , and had felt and heard the neurons in my brain firing away.
Electrical zaps. I am not kidding or crazy. I have heard of people who have felt a similar feeling. Now , even a month after stopping it I got this perpetual ringing in my ears. And I can hear my blood flowing past my ear to my brain.
I was really close to either a bad ending or admitting myself.

Ok. Now back to the pain issue. You have a dr. who can up your pain meds ?
Hopefully he'll come through for you. If not , I don't know. If worse came to worse I probably would have to get what I need on the street. Something I really don't want to do. The other option would be to try and get admitted to a Psych ward and tell the shrink your at the edge of the cliff. Maybe he'll put you on Thorazine or something strong that may zombie you out but I doubt you'll feel any pain.

Good luck , keep posting.