Oh hun, it sounds to me like you've tried everything you could to make it work before making the decision to switch. No matter what circumstances bring you to it, it is never easy Formula feeding wont make her fat and it wont make her prone to colic, but you should start off with teats with a slow flow so she doesn't get too much at once, because that's what can cause the belly pains. It would be best to start with a formula that isn't a 'gold' one as the gold ones are quite rich and some babies can have upset tummies on gold formulas, as well as constipation. I would get some infacol or brauers to help with that jic it is an issue for her. It is also possible that you can express and give her the ebm as well. Simply not having to feed her 100% BM and knowing that she doesn't have to rely on you feeding her might give you enough of a break to recharge and heal and you may even want to give it another try. Unless you have loads of milk it shouldn't be a problem but don't go cold turkey - start off giving her formula on every second feed for a while so you start to produce less. It may take several months for your milk to completely go but it wont be a problem, and will usually only be a tiny amount.

Good luck and if you ever need more support, advice or encouragement, please post again. You have done such a wonderful job so far and sometimes the 'best' thing isn't always the 'right' thing kwim?