B.,
My kids are 21 yrs and 18 yrs and I just became a fist time Auntie, just back from staying with my sister to care for the little one. Little one had colic, gas really bad. we tried the drops but after 3 days they didn't work and i insisted my sister call the doctor. he suggested a special formula (a little more expensive but worth it) after 2 days on this formula she was fine. i'm sorry but i can't remember the name of the formula but i'm sure your ped doc can recommend one. also, I would let my niece lay on her tummy and that seemed to really help, especially when she slept. of course i was watching her while she slept on her tummy. also a time or 2 i rolled up a dish towel so that is was about 2 inches thick and put that under her tummy and she liked that as well.
Also try a nice warm bath or soak and run the warm water over the tummy, then when the bath/soak is done, wrap little one up really tight in a blanky with the arms down to the side. my niece slept for 5 hrs on her back like that.
Good luck,
L.