You said cymbalta and flexeril? I can't say about cymbalta, as I've never tried it, except that you may need to start at a low dose and work your way up if a lower dose is available.
See if it's the flexeril first though. Ask around here, and I think you'll find it knocks a lot of people for a loop. I don't knock out easy at all, but that stuff even makes me sleepy.
My doc switched me to methocarbamol instead, which works well and doesn't make me drowsy.
BTW, congrats on the new baby!