Vistaril (hydroxyzine) while basketball

I like playing basketball with friends and for the most part, I’m relaxed. However, we’re entering a tournament and those types of situation usually gives me major anxiety so I tend to tense up and overthink. 

I also noticed that there’s times when I’d hit my weed pen like an hr before games or would smoke Delta 8 CBD, I feel a lot better and perform better. 

I was prescribed by my doctor some Hydroxyzine (Vistaril) 2 months ago but I never took it. My question is that, will taking Vistaril while playing basketball cause performance issues? I’ve read some side effects on drowsiness and possibly brain fog. 

If vistaril is not a good idea, any recommendations to relax while playing Bball to calm the nerves?