Oh Charlotte. I understand where you are coming from. Personally, I couldn't IE until I had taken some other steps. I really believe that people who lose a lot of weight are in a slightly different place than most people that chose to IE.
For one thing, you are supposed to believe that your diet has failed you. It is the cause of the problem. Did LL fail you? I know Cambridge didn't fail me
You should not be concerned with weight gain. I was and it sound like you are.
You see, most people who do IE are fed up with failing on diets. They have little to lose by chosing IE, gaining a bit etc. In most cases, they are fed up with losing/gaining a few pounds on and off. Yoyo dieting. Christmas gain, then lose for summer.
It's not such a big deal to gain a little more.
Now this isn't to say that you can't make IE work. I have after all. Okay, it was slightly tweaked at the beginning because I couldn't blame the diet for failing me. I couldn't just eat what I wanted. I had to legalise things carefully. I had to deal with some of the other head stuff a different way. I couldn't blame the diet. I couldn't just say "I eat this because I haven't been allowed to...because I've dieted", because that wasn't true for me. There were other things going on.
Anyway. I have written so much in the past about it, that maybe you've already read, and really ought to get on.
Just to say, I do understand. Do proceed with caution chuck. It's a fantastic way of eating and I'm loving it, but I found I had to do a fair amount of work before I could really embrace it wholeheartedly.