Basketball

So about 3 months ago I had a nasty level 2 sprain on my left ankle (which also had a bad level 2 sprain about 2 years ago) and for the past 3 weeks have started playing again. Well I noticed that I'm not anywhere near as quick as I used to be and I cant jump as high as I could before. I'm pretty sure that I also can't move well laterally anymore because I was considered the best defender at the park where I play and now people drive on me with ease. I thought it was just the rust of not playing for a while but 3 weeks should have been enough time for me to get back into form. Anyways my question is what exercises could I do to get back range of motion, flexibility and strength back to that ankle?

Edit** sometimes I show flashes of the old me but I usually fade into obscurity again for some reason after a couple minutes. Some people are saying its mental but I don't think it is because I still try to drive and jump.

you done lost it son. step off the court and play ultimate frisbee like all other white people

Yeah, except I'm not white. :D

Grab ones of those thick rubber band things with the loops (if you're an athlete go with stiffer ones) and wrap it around something. Stretch it out and put your foot in the loop until it's around the ball of your foot. Move your toes (emphasizing that the heel should ultimately be stationary) out, then turn around and pull them in. This is a common strength building exercise following ankle injuries.

You could also try doing toe raises with your toes straight, then pointed out to the side, then pointed inward.

I have total rupture in my achilles tendon and am now in physio with it..
and my expert doctors have told me in many cases of traumatic injury (just like yours and mine), the nervous system is also hurt. This means it won't just heal by itself, but you have to do corrective exercises... luckily for you, I can instruct you on how to do them ( I got plenty of them from my physiotherapist).

1. Get a rubber band (like mentioned above), do exercises in all 4 directions.
ie. hold the rubberband in your hands, keep your leg straight, but the other end of the band behind your foot and then point your foot.. hold it pointed for 2 seconds the flex it back.. hold for 2 seconds and point again etc. (do this for 15-20 repetitions)
Then tie the band to somewhere and do the same thing for other directions (ie. resisting the flex and easing on the point.. to left and to right).

2. calf raises (stand on a edge of something.. step-up board for example) lower your heels below paralel level then raise your heel as high as you can. hold each end for 2 seconds (do this with both feet on the board if you can't do with one foot).

3. Stability and balance.
This is very important for the mentioned nervous system. Take a pillow or something soft, stand on it with one foot (the hurt one) and try to raise the arch in your foot (ie. stand on the outer edge of the foot) hold your balance for about a minute. This needs to be an automated thing for your nervous system, so to add difficulty grab a tennis ball and joggle with it to keep your concentration elsewhere (this is also a very important thing, can't tell you why though :D ). Once you have this down you can get a balance board and use that, but for me that is still impossible to do.

4. Stretching..
you want the foot to be as flexible as the healthy one. there are plenty of good stretches for your calf, if it's very tight you can place a towel behind your toes, keep your leg straight while sitting on the floor and pull back those toes to feel a stretch in the calf. if this doesn't stretch anything place your heel near a wall, then lift your toes on the wall as high as you can (heel as close to the wall as possible) then bend your body forward to feel the stretch in the calf.
Also stretch the point directions, which can be easily done for example by sitting on your knees and pointing your foot below your ass, then just lowering your weight to sit on your ankles.
Important notion about stretching. The hurt foot is most likely more lose than the other, so it's important you don't stretch it further than the other foot flexes... This way you're going to make it more lose than the other leg, which gets injured more easily then.

5. walking, jogging etc.
make sure your range of motion is the same in both legs while walking. You should step heel first then roll through the whole foot and your toes should be the last thing that leaves the ground. your knees should point in the same ankle (preferably forward but this is unique thing, as long as it's symmetric). Never ever let your knee point to different direction than your toes... this will cause problems in the long run (in your knees and hips).

and if you feel sharp pain while doing any of these, you should ease a little.
seeing a professional might also help :D

EDIT: and I do apologize for the bad english, hopefully you get the point. If not just say so and I try to elaborate.