I have gained 5lbs in total over two weeks but it's going back down again already. I am in maintenance so lucky that if my calories are around 1600 or less the weight starts falling off again. Luckily I don't drink much or often ... Its deffo the sweets and choccies that get me. But I have hot awful stomach ache with the amount of sugary stuff I have been consuming over Xmas so hopefully my head will very quickly get back in gear. My maintenance diet is actually very similar to the rules I followed when I was losing weight, apart from the fact that I now have full fat yoghurts/cheese etc and more milky drinks instead of lower fat alternatives...so it's really easy to get back into losing if I need to.
Typically for me:
Breakfast - yoghurt/granola/fruit or porridge or crackers and ham/cheese/egg or 1 slice of toast with butter and jam or peanut butter
Snack - protein bar
Lunch - protein first (salmon/tuna/ham/chicken/egg) and salad/veg and/or crackers
Snack - fruit or yoghurt/fromage frais
Dinner - similar to lunch but with a carb such as a couple of desert spoons of potato/pasta/rice
Snack - milky coffee or hot chocolate
I very often make homemade vegetable soups/broths as although its slider food, I find it filling and it helps me increase the amount of veggies I consume, as otherwise I wouldn't have enough. Generally (apart from battered/breaded fish portions which I find are a really satisfying standby frozen food) everything I have is homemade in bulk and portioned/frozen (stews/bolognese/shepherds pies) so I know exactly what's in it and I can make sure its got plenty of protein in. I don't ban any foods, and I don't limit carbs or fats because my body needs them. I do plan my days food ahead however, and quite often I have spare calories so if I want a 'treat' I can count it in, without ruining any good work .... Christmas period excepted obviously
like you said, I can eat a house full of food too .... But if I focus, while I am not perfect LOL most of the time I don't. You can do it ... Think positive, maybe the 9lbs will have given your metabolism a boost and they will drop off when you refocus ... Good luck