I'm having the same issue atm. I've lost a lot of weight since having DD, and I lost 4kg in one week. Sane as you, BFing, stress and not eating. For myself, I've gone on lite & easy for a few weeks as it's there and easy to have on hand. Another tip people have given me which works really well is to set alarms on my phone reminding me to eat. Might sound silly but it's helped heaps, otherwise I find the day just gets away from me, and before I know it, it's 8pm and I still haven't eaten!