I forgot the most important part... ...

...during those periods of lightheadedness, I discovered from reading posts here, that I was not eating enough. It's important to keep your calories up and perhaps add in some snacks in the event that you're currently sticking to three meals a day. I was a little worried about eating more at first, concerned that I would slow my loss and become accustomed to eating too much food. But I added in some extra calories and some snacks when I felt a little rundown and lightheaded and that helped me.

My worries were unfounded...eating a little more at the beginning did not lead to continuing gorging.

Sorry for the multi-posts...

Donald