As a patient with chronic muscle pain for 5 years, I wouldn't recommend Cymbalta and Lyrica.
In my opinion, Lyrica is just something like heroin which narcotize you and you wont feel the pain. It absolutely doesn't heal.
For me, Cymbalta is the medicine with most side affects among the medicines I tried in my whole life. This one just increase some hormones like dopamine and neurotransmitters which results reduction in pain but again doesn't heal you.
If your pains are in an unbearable level, gabapentin (neurontin) could be more innocent alternative.