It's a dopamine response. You feed your brain sugar and it wants more sugar. Over time it takes more and more sugar for your brain to be happy. Like anything else that feels good you become numb to it if you do it too much. You need to cut refined sugars off cold turkey and limit your complex carb intake for a while until your brain can reset itself. After a few weeks cravings go away and you can readjust your macros to allow more complex carbs like oats into your diet. Once you have established healthy eatting patterns you can have a small sweetie once in a great while for holidays or family gatherings.
Also remember milk does have lactose in it so you need to cut back on whole. If you drink skim stop. Skim milk contains more sugar by volume since the removed butterfat ends up being replaced with more concentrated skim.