Fell Off a Chair While Standing

3 weeks ago I stood up on a chair and fell of backwards.
In the process I must have twisted or sprained my right foot.
It became swollen and bruised and I could not walk.
I still cannot walk, but I was always able to move it.
I am now able to put it on the floor flat while standing but I cannot walk.
It is also very stiff and feels like a ton of bricks.Any suggestions?