I've only ever been like that when I'm sick, but I was watching Supersize v Superskinny the other day. The superskinny lady was basically existing on buckets of tea every day When she was forced to swap meals with the Supersize lady, she had to choke down the food for the first couple of days, but after that she found she actually started to get hungry - she was amazed, because she hadn't felt hunger for so long!

Maybe this could be a great time to set out an eating plan that you're happy with - sugar free, GAPS, paleo, whatever - and force yourself to eat at proper times; then you can train yourself to be eating right and at the right times, without having to fight old habits at the same time