I have pain in my back and chest, the pain is unbearable and I can’t sleep?

My age is 64 ,male .My pain is for 8 months now ,i did all mri’s scanner but nothing went obvious.The doctors said it is nerve and i am taking lyrica 75mg 2tablets morning and two at night.My pain is in my back and turn to my heart that i feel my boobs burning.
the pain is unbearable and no sleep ,i have been taking lyrica for two months now