In reply to neilwiltshire:
Sounds like a pulley injury. If in doubt, seek medical advice. If the GP sounds like they are talking B/S ask to be referred to a hand specialist. Pulleys and ligaments can be heard to be damaged, from very slight displacement through to complete rupture. Slight damage will recover with care, complete ruptures require medical intervention.
Hope you followed the icing procedure.
Give it a week or so and try the finger gently, perhaps buddy taping, or support taping (won't help the cure, but will remind you it is damaged)and see how it goes.
I am not a medic, but have abused my hands since 1967, and mostly got away with it!
Post edited at 12:54