Sorry to hear about you feeling bad that happens to me to without a reason.
As far as your Norco goes you don`t have to ask ANY doctor for the brand name you Dr signs the script authorizing the use of a generic if YOU want it.
The insurance company may charge you more if you have it but I don`t even know why you use Norco you dont take that many (I dont think) to make a difference with the Tylenol.