I don't think you're diabetic, you just congested yourself by the yo-yo business. :) A simple blood test for a physical includes glucose - which should be taken after fasting for 10 hours. If it's above 100 something, oh dear I forget the exact range, there's an issue. Did you ever get regular blood tests done? Always get copies of your lab reports/blood tests, you need to know whether these numbers start changing, even if they're in normal ranges.

Unfortunately, anorexia coupled with binging/purging is very very tough on the body. People's awareness of this is very limited and so it's not treated with the amount of intervention that's really required to spare the victim more problems later down the line. It's fixable, but you have to be very balanced to recover fully.

Is the fatigue after eating your only symptom? Do you have ANY others? Please click on the fAQ link and read the post about how to get help - it asks questions about symptoms you may not even know are symptoms. :)

It's quite easy to burn off extra pounds when the liver is clean. This is the aspect of weight loss everyone misses out on because the books on nutrition are so abstract, they never point out that carbs and fats and proteins are all converted into energy in the liver. If the liver is clean and healthy, it burns everything great, our metabolisms are high. It has nothing to do with the thyroid, it's all about the liver.

Hope that helps! :)