Why is it thay some morning i wake up and feel heavier than i am and some mornings i feel my normal weight?

Vague: Very difficult to access without a thorough history and exam/tests. It may be something to do with your digestion or nutrition. I would talk to a dr. But in meantime i would keep a diary of your nutrition, supplements, any meds, activities and how many ounces of water/beverages you had each day. Then write down how you feel each morning after.