Having had problems with my left ankle for the last 14 years, I think that I can grasp your pain, especially since the times that I've sprained that ankle must be getting towards 100, if I haven't already passed it.
I'm not sure why your friend thinks you have microfractures since that shouldn't cause any inherent weakness, which seems to be the issue. My guess is that you probably didn't recover sufficiently from the original injury before reinjuring it, but you could also just have weak joints. I'd do everthing that I could to strengthen the surrounding muscles and connective tissue. Back in the day, I used to show up an hour to two hours before practice to do physical theapy, which usually consisted of using my foot to "write" the alphabet in the air or under water, doing hopping drills up and downstairs or in grids and using a piece of surgical tubing to do pulls in various directions. I also braced it whenever I went for a run, and I got to be pretty good at doing a heal lock on myself.
The chunk that is missing in the xray could just be a divot (for lack of a better term) where a piece of connective tissue crosses the bone to where it attaches. You'd also feel a bone chip pretty easily since the chip would be causing major irritation once the rest of the injury is healed.
Good luck!
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