Finasteride - can this drug be the cause of blured vision, fatuige and headack in cap of head area?

Headache is a known side effect of finasteride and I guess fatigue could be related. Although blurred vision is not stated as a known side effect, if it started after you started taking finasteride I would recommend that you please see your doctor (if you haven't done so already).

https://www.drugs.com/sfx/finasteride-side-effects.html