Welcome to the forum Steven, many of us are on here trying to get a handle on what's happening to us.
We've got our preferences, but I couldn't get by without putting all my food consumed in a day through an nutrition app of some sort, I use fatsecret.co.uk through a browser, it's free. As @exfieldok mentioned weetabix is pretty much loaded with carbs. Fatsecret tells me there's 29g of carbs in 2 weetabix with skimmed milk. That would leave me ravenous within half an hour!
This morning I had 3 rashers of back bacon, 2 large eggs mixed with double cream to make scrambled eggs, and three large mushrooms sliced and fried in butter - total carbs = 3.3gs. This breakfast keeps me going till dinner time without a problem.
There are more carbs in milk, so I now have the luxury of having double cream in my coffee (about 1 carb). It's just a matter of adjusting to see what works for you.
We're all different, and what might spike my insulin might be ok for you, that's why you're testing.
If you keep your total net carbs in a day to under 20g, you'll be doing keto, meaning your insulin will be kept low (insulin makes me hungry), ketones will rise (making people satisfied) - ketones also have the ability to raise your metabolic rate, which is great for energy - many sportsmen are on the keto diet because of the energy boost.