Small Fiber Neropathy and Cymbalta

Hello everyone,
I was diagnosed with SFN a couple of years ago. I have burning pain throughout my body but the worse is in my head. I feel like someone is pouring something very hot on my brain.
I’ve been on Gabapentin and Lyrica with no relief. My neurologist put me on Cymbalta 30 mg in June and then 60mg with no difference. He just started me on 90 mg. Has anyone had any success with this medication? Please share if anything has helped!

Thank you in advance!
Janet