Hi - I did my 5th met last February. Airboot for 4 weeks and then being really careful for another 4 weeks and I started using it again properly. Started out doing just 200m, then a little bit more etc. It was sore on and off but I took things very slowly. No hills, no uneven surfaces etc. By late May I could run fine and it just ached a bit but didn't hurt.
Then in June, I did it again. Nothing to do with the original injury, just a freak trip over a stone that resulted in exactly the same break. One in a million chance.
Followed the same process, airboot, walking, very very short runs etc. By October I was running with the ache and since Christmas I've been running without any discomfort at all, either during or afterwards. In fact, I'd forgotten I did it until I saw your post.
The mets get poor blood flow so heal slowly, and my view was that using the foot must help the blood flow therefore I made sure that I kept using it regularly but treated it gently. Also, keep the foot warm (socks in bed) as this improves blood flow. Gently massaging the area to get the blood moving doesn't seem to have done any harm.
Hopefully you're on the mend. I'd rather have a broken met than Achilles tendonitis, that's for sure.