My DD was the same due to colic & reflux. I found holding her upright for a while after a feed helped & taking her for a walk in the pram( the bumping motion over the road helped to settle her). I have heard the hug-a-bub sling/carrier is really good when bub is unsettled. I demand feed also which is generally every 2hrs during the day. I think it was worse when my DD could sense i was stressed so having a warm deep bath with her helped to relax both of us.
Goodluck. xxx