Sorry to hear that sboardcrazy,
I've injured my left ankle 3 times windsurfing in a 5 year period (in my early 30's) and it's taken me about 3 more years to fully recover, and probably "fully recovery" is not the right term, I'd say more like a 90% recovery. The first time was due to recurrent over-flexing by incorrectly practicing the vulcan, the second time was due to having my foot stuck in the footstrap whilst immersed in a dishwasher-wave, and the third time was again practicing (incorrectly again) the vulcan.
Nothing that hasn't been said already: do a proper recovery and physio rehab. I rushed back into windsurfing way too quickly after my first 2 injuries (like barely 2 months recovery) and the ankle was still too weak and too tender. After the 3rd injury I took a good 6-month rest with gentle rehab before I went back into the water. Even once in water, I restrained from practicing certain maneuvers for about 1 year. In hindsight, I should have done this right from the first injury and probably I would have avoided the other two.
Anyhooooow! I hope you have a good recovery and that you can -gradually- get back on the water soon!