D..
She shouldn't be eating constantly. Start a food diary - do it for a whole week. Write down everything she eats, what time, and how much. Write down exactly when you start nursing and when you stop, and how often you are doing it. Write down when she has her poops and what consistency they are, and if/when she struggles (the part you said about her getting bound up.)
How long does she nurse when she nurses? Are you letting her snack on you? You have two types of milk - the front milk, or fore milk - thin and easily digestible, so that she gets hungry really fast if that's all she gets, and the thicker, richer hind milk after the fore milk that will hold her tummy. You need to let her get hungry enough to nurse one side of your breast until it's empty. You can go to the other breast at the next feeding. You have to train your breasts to make that hind milk if you've been letting her nurse at short spurts really often. Letting her have the nipple any time she wants is NOT what she needs. After you get your breasts trained to make that hind milk and she's getting it, you can offer her both breasts when she gets growth spurts.
Don't stick food in her mouth just because she cries. There are babies who just need to cry and their mommies mistake it for them being hungry, so they end up snacking all day long. How can a baby feel hunger if it's eating all day and all night?
You mention that you tried CIO. I submit to you that you don't know how to sleep train. Talk to your ped about how to handle this (and take that feeding/pooping diary in there with you.) He or she will tell you exactly what to do and you MUST do it to a letter every single night no matter how hard it is for you. If you can send your toddler somewhere else to sleep for a week so that you and your husband can do a hard week of sleep training, you will make headway.
You need to work on the day feeding problem first. Then work on the night sleep training which includes not nursing her every hour.
It's like the airline instructions for the air bag that drops - you put your own on before you help someone else put theirs on. You have to take care of yourself and get rest. You just have to so that you can be a good mommy.