5 month old all of a sudden gy AGAIN??!!!?

My daughter was very gy when she came home..after about 2 months, 4 kinds of formula, and alot of crying...we finally got her on GoodStart formula w Dr. Browns bottles, and some mylicon when needed. Everything has been great up until about two weeks ago when the gas started all over again. Now nothing is working. Tried gripe water, EVERYTHING! Does anyone think that I should maybe try switching her formula again? ANY SUGGESTIONS WOULD BE GREATLY APPRECIATED!