Perhaps when you weighed yourself, you had an overcoat on, with iron bars in the pockets, that would account for it.
Your diet is rotten. You're a candidate for heart disease, type 2 diabetes, renal failure, halitosis, gastric ulcers and probably green monkey disease.
While I am here, I shall simplify things for you, it is impossible to put on 8 pounds in a ****ing day. Your scales are ****ed.
Ever heard of things called fruit and vegetables? Throw away the protein shakes, eat a balanced diet, drink plenty of water and do sustained exercise such as walking, cycling or swimming.