My bub us 5 weeks old and every Di often since she was 3 weeks she seems to get really cranky when feeding. She really pulls and pushes on nipple as if she is trying really hard to suck something out. Then sine times she will start crying. A few times I have stopped and gave her a bottle of expressed milk as I thought she wasn't getting any milk. I phoned a lactation consultant who says I shouldn't have run out of milk and to keep persisting so she wasn't much help. I tried pumping after feed and hardly anything came out. What to do?