it seems 2 b just girls, im afraid. only advice, a dummy maybe? and if it gets too much walk out the room, with her safe obviously (iam sure u would). sorry not much help, i know. my daughter was like that, shes nearly four, and when she decides on something, thats it. and think weve got the joys of teenagers yet.lol
also could it be constipation (if u bottle feed its quite common), my daughters always suffered with tummy aches from it. Or maybe reflux? i know it feels like it, but it wont last forever, doesnt help you much now. xx