My rooster fell off his roost that was only about 2ft high and now he limps and by the 2nd day his foot had swelling I'm very worried and need advise if I need to splint his foot or let it be?
I would splint his foot and quarantine him so that he doesn't run around too much. Always keep fresh food and water for him, and you can also give him some milk for more calcium, and some vitamins to keep his body functioning.
Do you have any pictures of his feet and legs? Right now, I would try to limit his walking around and no roosting. A crate with food and water is usually a good way to do that and keep him in with his flock.