The side effects list all the standard hormone therapy side effects, but you're already on hormone therapy and have probably got all the hormone therapy side effects you're likely to get. The one of these which Enzalutamide does sometimes make worse is fatigue.
Hormone therapy usually pushes up blood sugars, so you'll need to keep a close eye on what effect that has on yours in case the Enzalutamide has any additional impact here. Also keep an eye on blood pressure and cholesterol levels.