I’m sorry you are going through a rough time. It is very unusual to have persistent pain weeks after xeomin injection and as far as drooping is concerned, unfortunately it will take time for it to reverse. You should start seeing improvement within a month and progressive improvement until it is all gone in 3 to 4 months.
Xeomin typically lasts about 3-4 months. It can take about a month for a brow that has dropped from Xeomin injections to lift back up. Pain is not normal after Xeomin injection and I would contact your doctor as soon as possible regarding this.