I sprained my ankle quite badly about 7 years ago. Whatever you do, do not take off the splint prematurely! I made that mistake years previously when I dislocated my shoulder. At the time I did my ankle, I was teaching aerobics and was very active physically. I didn't have insurance at the time, so didn't go to a dr, but got myself a pair of crutches and forced myself to totally stay off my ankle for 2 weeks, and I mostly stayed off it for a while after that. I did, though, after the 2nd or 3rd day, hobble out in my crutches to a swimming pool to swim. I kept my ankle bandaged and splinted during the swimming for quite a while. I am sure if I had been under a drs care they wouldn't have allowed the swimming. If I had it to do over again, I probably wouldn't have done that so soon either. But at a certain point, I do think it helped my ankle regain flexibility.
I did everything very slowly. After a while, I began using a stationary bike for exercise. I strapped my foot in so that my ankle would not move... I also did very gentle stretches, foot circles, etc while NOT weight bearing at first. I remember the first time I went back to the track to run. I drove there (whereas I used to ride my bike), walked slowly around the track ONCE, (I used to run 6 miles or more) and drove home! I increased in very small increments. One time I got overly confident and used a piece of cardio equipment I shouldn't have too soon, had pain and a setback, and had to get off the ankle again for a few days.
My boss told me it would be at least 8 weeks before she'd let me teach again... and I am so glad! My ankle is great today, and I really don't notice any difference between it and my "good" one except it is slightly less flexible and if I were to go on a really long run (I did run a marathon about a year after the injury!) I might feel it.
Another thing that really helped once I was weight bearing were calf raises with good ankle alignment.
Good luck and hang in there!