went to the hospital yesterday because of my migraine that has lasted a month. they gave me a shot…

went to the hospital yesterday because of my migraine that has lasted a month. they gave me a shot which made it almost better and sent me home with pain pills. it says to take the pills every four hours if need well by the end of the four hours I'm in extreme pain. I wonder if I'm gonna be in pain like this and have to take pain pills for the rest of my pregnancy....