Purchase an ice machine STAT. Fill up large yogurt containers to make big ice cubes. Wrap your knee when you go o bed with the ice machine. Let it soothe your knee all night long.
Take a pain pill before bed for sure as well. Are you allowed NSAIDS (non-steroidal anti inflammatories like Ibuprofen...). Make a medication schedule for pain control.

Should not be that swollen that you can not exercise or function…. But yes you have reason to be concerned…. Try mfr that brings down swelling tremendously… good luck I hope works out better for you than myself ….