DD2 was like this and it was terrible. she had silent reflux, only diagnosed at 12 weeks for which she was medicated (Losec suspension). i also took her to an Osteo here in Melb, who specialises in Paediatric Cranial Osteopathy and the medication combined with the Osteo was a godsend. DD2 was still a hard baby but the two combined did help her. However the only thing that worked the best was time and her gut maturing.
i hate admitting it now, but i only really started enjoying her when she was about 15-16months (she turned 2 in Feb this year). but it does get better hun, hang in there