TAKE IT AS PRESCRIBED!!! THIS IS VERY IMPORTANT!
You MUST TAPER YOUR DOSE WITH PREDNISONE! FOLLOW THE INSTRUCTIONS!
They give it to you in a neat little package that says DAY 1, DAY 2, DAY 3, etc with the # of pills you MUST TAKE and WHEN TO TAKE THEM!
Follow the fucking wrapper. Its very important. Your body stops producing certain natural hormones/steroids while you are taking prednisone. Therefore, you must accustom your body to going without it once again.
As for what everyone else is saying? Prednisone CAN have some interesting mental/physical effects. It is NOT an anabolic, you are right, but it s a pretty crazy drug that does have large impacts on your body. Reports of prednisone causing the EXACT effects the op is describing are NOT unheard of, as well as making people have weird thoughts/dreams/etc.
Basically: this giant dose of a super powerful steroid CAN cause strange and interesting reactions in individuals. Euphoria is extremely rare (but not unheard of I guess), along with all the other mental effects.
I've been on prednisone a few times ( I have bad reactions to certain foods and other allergens, along with poison ivy that have ended me in the ER with a script of prednisone) as WELL AS seen my father on MASSIVE AMOUNTS of the stuff after his liver transplant. And THAT caused some interesting effects in him, let me tell you that. Docs said it was normal, but damn it was like he was tripping sack from that stuff (I'm talking crazy IV doses here not the pills you get).
Anyway, prednisone is a VERY STRONG CHEMICAL that should be RESPECTED in the utmost and the rules should be followed to the T with it.