Hi Craig
I think oatmeal is much denser than Cheerios. I like Cheerios, but if I wanted a serious carb, I'd do oatmeal. I like the steel cut oats, although they take longer to cook.

You could try another breakfast and see how it goes. One thing I've found is that solid food holds me better than shake. So I added a bunch of stuff to my shake, like cottage cheese, greek yogurt, and sometimes peanut butter. But I also have a mid morning snack. And given your activity level, I think you will still need a planned snack. While you are doing all that walking, you are carrying mail too. I don't know how heavy it is, but that makes it even more exercise. When I had a job where I was walking for miles every day, I needed snacks and extra food.

Also, I noticed three sweeteners in your shake (acesulfame whatever is a sweetener, as well as the sucralose and maltodextrin) so next time you buy protein powder, you might want to buy one that isn't sweetened. Then you can sweeten your shake yourself with sweetened almond milk, fruit etc. The good part about that is that you control how sweet it is. And fruit is better for you than those sweeteners. I like George's restore. I also use it to bake yam bars, which I use as a snack when I'm hiking.
Allison

: Update:: I had two bowls of cheerios
: this morning along with my shake
: and still crashed in the early
: afternoon! I am really starting to
: think it HAS to be something in
: the shake I am not reacting well
: with. I am going to experiment and
: try getting my protein in the
: morning from meat for a few days.
: Do you think the oatmeal/hot
: cereal would make a bigger
: difference than the cheerios as
: far as a compliment? Thanks,

: Craig