This is exactly why I refuse predisone.... we used it years (7or more years ago) for both Nitschke and Banks and for everything you list I told our vet at some point... no more! We did the allergy test to find what was causing all the issues with them and the Pred has not been in our house or our bullies since then.
The dosage is most likely 10 or 20 mg.
Nitshcke wasn't too bad, but he would go into fits of what seemed to be 'speed freaks' and he would pee where he was standing, like he did not know it was coming.
Banks -- roid rage is right on mark. She would fight, pant like a mad-woman, run, fur always on end, eating like she had not had food in weeks... she would drink a whole bowl of water in minutes, chew ice and pee all over the house -- it was horrendous.
Get the Pred out of his system for 30 days and talk to your vet about a full blood screen allergy test to see what is causing all the ear.skin infections. There are alternatives if you know what is causing the infections... the Pred is only covering up the issue.
Can ya tell I do not like Predisone?