T., I once thought I had a gas issue with my first child. I read a book once called "Colic No More" where the author /Dr. said most crying is caused by baby being aggrivated by not enough food or sleep, which are the two greatest needs, and that pain crying is rare in a healthy infant. The intake of lots of air due to lots of crying causes extra gas. Further he said that aggrivation in a baby looks alot like what people might think is pain;, red face, clenched fists, pulled up legs, crying loudly. And they will continue to cry louder and louder until you meet the need. If they go too long crying without having the need met, they go into hysteria, where even if you finally did give them what they want, they will still cry because they are so worked up. At your daughter's age, once she is fed and diapered, afternoon naps should come after only being awake about 10-20 minutes after the feeding. If she is up longer than that, and she starts to cry, getting louder and louder, while you pat or walk her, she is probably crying because she needs sleep. I think you might have an 'I need sleep' cry rather than an 'I have gas' cry. It's worth looking into. The book worked great for me. Also he said babies will continue to cry after they have been put down (in a bed) for the nap, because sleep hasn't "come yet" and they are crying out of exaughstion.Babies who are walked or swung get more stimulated rather than allowed to unwind laying in a bed. This book was a lifesaver for me. I tried Mycelex drops on occasion, but they didnt seem to make a difference.
Some one suggested soy, and I say PLEASE don't give soy. I raised my first child on soy formula, only to have her develop thyroid disease and arthritis. Her disease started when she was only 2.5 yrs old. I wish I would have know then what I know now- I cant reverse the damage. Soy formula is like giving 5 birth control pills a day to a baby. Soy is ESTROGENIC. It screws up the endocrine system and thyroid, damages the kidney, stunts growth, kills fertility. Please look into soy, which has been studied over recent years and is JUST NOW getting uncovered, but still, because mainstream media doesn't cover it , it gets hushed up. (not surprising soy info is hushed, soy crops are America's top money making industry.)
Look for yourself: http://www.westonprice.org/soy/infant.html
Increasing your water intake should help with increasing milk supply.