That sucks. I know because it happened to both my wrists.

Aside from rest, there probably isn't much you can do except make sure you get enough calcium and vitamin D in your diet so the bones have material they can make repairs with.

One nice thing about the skeletal system is that when a bone is damaged or stressed, it re-builds itself up stronger when it repairs. So hopefully you won't have to deal with this again.

But yeah, I found a month off from the gym was the only way to make that pain go away, permanently.

One thing you might do to avoid this in the future is to ask your coach to double-check your punching technique. If you are over-extending your hook punches it will stress the bones in your wrist (I learned the hard way about that.) I imagine improper technique with other punches could also hurt...

Best of luck!