Main thing would be to look at eating foods with a high satiety. These are pulses, grains, vegetables basically any food high in fibre. Also what will help is a protein source with each meal. One meal that always fills me up well is an omellete with a sweet potato. Or whole wheat pasta.
If you feel dizzy etc despite eating well, see your physician. Coukd be many causes ranging from low blood pressure, stress, to an overactive thyroid. Get it checked out.
Do or do not, there is no try.