Tylenol 3

I need some advice from anyone who's taken Tylenol 3 with codeine. I've been having terrible migraines and my doctor gave me fioricet and Tylenol 3. The fioricet doesn't do much. Helps for a couple hours then the pain is back. I have work tonight (I'm a waitress) and I'm tempted to take the Tylenol 3 but I'm afraid it's gonna make me doped up or something. Should I take it or is that just a bad idea??