Munis

I got my gastric sleeve on Thursday August 31,2017 and I am beginning to question if I made the right decision. I know I was not in a healthy place with my weight and it affected many parts of my life but I feel depressed right now. I wonder if I will survive this and if I will ever be happy. I'm on day 5 post up and I'm extremely hungry, tired, and I feel nauseous. Is this normal? Did anybody else have these thoughts or is something wrong with me?