Is it necessary to receive physio after an ankle sprain?

i am a 31 year old male, i sprained my ankle during april 2010 due to missing the step at a front door of a house, i went side ways on my left ankle, it was quite painful, i noticed my whole left leg got quite hot for a few minutes and i was in a bit of shock. anyway this happened on a saturday evening i was working, so i put ice on the ankle when i got home put maybe not for long enough i don't know. i also went to the cinema later that evening which was probably not a good idea. on the monday morning i went to the doctor she looked at my ankle done all the examinations she had my ankle bandaged and told me when i go home sit back put my foot up high to let the fluid drain out of my ankle and to take tablets such as neurofen to reduce the swelling. that was fine i did all that for 2 weeks i am now out of work because i was let go june 2010 due to staff cutbacks. up to lately my ankle was fine i do play some basketball with a club i was playing that with no problems but then suddenly within the last few weeks my ankle started to swell and pain me again, but this time i also noticed my left leg getting weak and getting stiff, this has been happening on and off for the past number of weeks. could it be because i never received physio therapy by my doctor?????? i also wore a support stocking for a couple of weeks.