Why is my stomach small and tight in the mornings and expanded and bloaty in the evening ? i'm eating healthy and correct so it's not the food/sugar?

Digestion imbalance : Common problem. You may need probiotic or to look more carefully at which foods associated with bloating.

Food sensitivities: You probably have food sensitivities and/or impaired digestion. A high percentage of the population has gluten sensitivity or food sensitivity genes. You can get this tested without a doctor's order via enterolab. Ask for the gluten genetic panel for $149. You may also need betaine hcl with meals to help digestion and may benefit from probiotics.