Welcome to HCM
You have Diabetes
type II and Neuropathy pain is from back and also diabetes if there is neuropathy.
As you are already taking Lexapro which is anti depresant/mood elevator many times it also improve pain threshold and patient feel better, Lyrica is good drug if it is not tolerated there is no question of it's use.
Neeurotin can improve pain of neuropathy while analgesic
do not help.
did not help you can discuss with your doctor to give other alternative other wise you have to pain clinic.
Supplementation of vitamin B12
helps if there is deficiency so kindly check for it.
Take some kind of meditation
and yoga it should help you.