I haven't tried it myself, but Dr jarvi told me they had some good results from it, but there was a high risk of suicidal ideation with cymbalta, so they avoid prescribing it.
Also, in clinical trials, a woman with no history of suicidal ideations or mental illness committed suicide while on it. I think the family sued.
Be careful with that stuff.
Broken record here, but consider alpha lipoic acid. I still take 600mg per day. It helps with the burning, stabbing pains far more than lyrica ever did. I usually place little value on supplements, but there's a lot of research behind it for diabetic neuropathy.
No side effects and it's dirt cheap too.