Firstly big big Its darn hard work luv and your not alone.

reading your post I too am thinking reflux or wind. I was going to suggest popping her on her side to sleep. That seemed to work with DD. Maybe also burp her while she is on her tummy- like lay her across your arm with her belly on your arm and burp her that way.

Im not saying this is the answer- but its worth a try.

Meanwhile....breath hun. Take long deep breaths....this to shall pass!!!