Baby 10m has recently started sleeping 8-(1-3) before waking for a feed. Previously she would wake every 2 hours or so but resettle fairly quickly. Now she wakes, feeds and starts banging on my other breast like I'm some sort of broken vending machine and she's trying to dislodge a jammed chocolate bar. She gets increasingly frustrated and agitated and ends up screaming until I walk her for ages until she drops off. Then she wakes as I lie her down and I try to feed her to sleep again. We repeat the cycle for a good hour sometimes more. What is going on? I'm so tired.