That is a regular course of action to break what they call a "cluster" headache. It is a common treatment for anyone who gets them.
The first day is the highest dose and goes down from there. Every person reacts differently to it so it is hard to say.

Myself I have no side effects from that amt.
I have had hot flashes and cold sweats from higher dosages given to me for my lupus and for months at a time. If you are a coffee, tea, coke drinker stay away from it while you are on it and maybe that will help with both.

Actually a few weeks ago I finished a "medrol dose pack" same thing, but was only seven days.