I’m addicted to sugar and I need help

So I’ve always had a sweet tooth but since becoming a mom (have a two and a half year old) I’ve been so sleep deprived he hasn’t slept through the night since having him and I’ve used sugar and carbs to get through the day as I can’t have caffeine as it gives me bladder pain.

I’ve obv gained weight and I want to feel better in myself plus’s be a good example to my son and have a good relationship with food but I’m really struggling to get through the day and have no will power, I wake up and forget my plan for the day cuz I’m so tired all the time and out of it and before I know it I’m back on the sugar and once I start I can’t stop.

I’m wondering if I should go cold turkey as I’ve heard after a while once you have it again you don’t like it as it’s to sweet but I’m also scared that I’m guna go crazy once I have some again, I want to do this in a healthy way.

One thing I may try is to and put my sweetie money aside and after a few months buy myself something nice with that money like a stacking ring or clothes eg cuz I bet it all Adds up after a few months and I will still be treating myself.

Anyone else been though this? What helped you? I’m wondering if I should try therapy at this point but I can’t really afford it right now.