Weight not changing

I had surgery on May 8. I weigh the same now as I did one week post-op. WTF? I am following all the rules and eating roughly 600 calories per day, hitting all my protein and water goals. I can’t exercise much due to severe pain, but I walk around my apartment as much as I can. How the hell did I go through all of this pain and suffering just to lose less weight than I’d lose just counting calories????? I’m devastated.

UPDATE: I finally started feeling a little less swollen and I added more carbs and calories (giant double middle fingers to the asshole that said I was eating too much) and the scale started moving down. Thank to everyone except that guy.