It's likely your form sucks. No matter how strong the wrists, if you land at an odd angle, pain.
I'm not sure what your current program is, but isolating wrists is something to do on an off day. A good overall strength training program should be strengthening wrists as a byproduct of compound, heavy lifts. Think benchpresses, overhead press even deadlifts (mucho grip strength).
Work on form with the instructor though and let that wrist heal fully before killing a man again. hehe.