OKay need some outside perspective.... am I being an unreasonable control freak?

situation: I only see T every other week. I have an appt tomorrow at 7pm. My H had knee surgery on Monday. He is in a brace so he cannot bend knee. He's not supposed to put weight on leg without the brace on...He can unlock the brace so his knee can bend but only once he is sitting in a car seat so he can get his leg in.. Surgeon wants him out of work till next Thursday...So he wants to go to my son's basketball practice tomorrow night at 7:30pm (he is the coach but he has to assistant who ran it Tuesday night) so that means he will be unlocking the brace for the first time and try to drive for the first time when I'm not available to help... what if he gets there and cant get the brace to lock back or if he's in too much pain to drive home from being up for so long...

I told him I didn't want him to go because I won't be able to concentrate on my appt because I will worry... and its too late to cancel my appt for free....

Is it wrong for me to try to control him? He's not talking to me.