I’m sorry you’re having a difficult time. The surgery, dietary changes, etc. seem to stir up a lot of emotions & sometimes we need support to work our way through them. It is likely anxiety that is driving your desire for food, your poor sleep patterns, emotions, etc. Finding a therapist or counsellor to talk to will be very beneficial.
The surgery can help you lose weight but you have to be in the right emotional place to understand how & why you eat & to make the changes to take full advantage of the surgery.
We do lose at our own rate. Some more slowly, some more quickly. Both are right because every pound you lose is a win. Your 13lbs loss is great. I lost about 7kgs (about 15lbs) in my first 4 weeks so pretty similar.