I just covered this in my other thread but the culprit is simply your insulin levels, you need to eat something with a lot of fibre that will digest a bit slower.
Based on OPs OP (...) I would say they are blending what they should be eating whole or not eating at all, too many carbs being digested at once spikes your insulin, initiates cravings, however if it's not all carbs but still being digested fast enough, I believe that could cause a lack of energy. You need higher quality food, not supplements. Don't blend or drink any of your calories, everything whole.
Oatmeal is my go to, you can get a pound of plain oatmeal for under $5, tastes God awful but it's an amazing addition to your diet if your struggling with symptoms of hunger.
Certain cereals are OK, you just have to pay very close attention to their macronutrient content, also skipping the milk or going with something pea or oat based maybe better for you but milk is liquid carbs, the carbs in milk are created by something called Lactose, which converts into sugar so get lactose free milk if you really want it that bad.
Couple apple slices is an underrated snack, don't do the whole apple because your gonna spike off one likely but a few slices has that sugar kick and a bit of fibre. McDonald's sells apple slices, if your ever there grabbing a coffee, might be worth it to grab some if it's gonna save you a crash later.