Sick Pigeon Need Help, in Scotland

[Defender1956]

Found a sick pigeon 2 days ago its seems to be confused, it seems to have a balance problem and falls over quite a lot and sometimes it runs around in circles if it does not know where it is going and it has problems eating, meaning it pecks at it and throws it about a lot and its head moves about all over the place when it is moving about, please can someone help me as it is so sad to watch the poor thing