I have 3 suggestions:
1) Try getting a sling or a Maya Wrap so you can hold her all day long and still have your hands free to do other things. I love mine! They can run about $40 but are worth every penny.
2) Do you have a swing, bouncer or car seat? When my son was doing this, I placed him in those. They propped him up enough that it helped him sleep a bit better. Of course, you have to use all the safety precautions and never set the car seat on a bed. They will roll off onto the floor, or flip and trap a baby between a bed and the car seat -- I learned that one from experience. Fortunately I was standing right there when it happened and got to him right away.
3) Have you called your doctor? This sounds a lot like acid reflux to me. My son had it and exhibited a lot of the symptoms you're describing. Once we finally got his Zantac dosage right, he was a different baby!
Actually, I'd start with calling the doctor, then do the other things while you wait for an answer on that end.
Good luck --
K.