I used to have a very raw and powerful scream. Over the past few days it's been a lot weaker. You can even hear some wheezing sounds in the base of it. Will I be able to get the same power back eventually?

I suggest you visit the specialist in otolaryngology, you may be harming your larynx. And it could become permanent...

Screaming is rather hard on it. Why you do it? Is it part of a show or just for fun?

Like, are you scream-o?!
(i like scream0, so that would be cool. if not, your still cool)

It's back now, just had to rest for a few days I guess. I do different screams, I don't really do screamo. I guess you could compare them most to the Screams off of the Deftones album "Adrenaline."

<Added>

Oh and it's just for fun. Maybe I hope to be in a band someday.