What worries me about the idea of fasting is that I will eat twice as much afterwards to make up for it!

Personally I think if you've been on calorie-restricted diets recently you probably shouldn't try fasting for a while. Calorie-restricted diets derange the metabolism and that takes time to undo. You need to keep your nourishment up and never let yourself get hungry so your body starts to realise it's safe to let go of the fat - it probably still thinks there's a famine going on and it needs to hold onto its reserves.

Best way to reverse this, and to stay satisfied, is plenty of fatty red meat, as the others said. It's very satisfying and much harder to overeat than other foods. Beef, lamb, bison, deer, etc are what you want. 70% beef mince is cheap, easy to prepare, and as good as anything. You can add different herbs and spices to patties to stop them getting boring. Cheaper fatty cuts are often good slow-roasted or made into casseroles.

If you are eating the right foods, you shouldn't need to hold back - your body will tell you when it's had enough. The fact that you're still feeling like you should eat when you're uncomfortably full means you haven't found the right foods for you yet. To begin with, while your metabolism is getting back to normal, you might need to eat red meat three times a day. Nothing else boosts the metabolism like red meat. You'll know things are getting back to normal when you really don't feel like it any more.

btw I did WW the year before I went paleo. I lost a few kilos but it was such a drag I quit after a few months and promptly gained another 15kg! I swore
 off reduced-calorie diets for life. Then I started paleo for health reasons,
wasn't even trying to lose weight, and lost 30kg without trying.

Thanks Jean, I really appreciate this advice. I've felt like my diet was a battle that I've been facing on my own so it's amazing to have advice and support!