Oramorph haha.. 20mg promethazine should be okay if 30mgs makes you groggy, you don't want to take too much anyway as you can get delirious which isn't fun. It will help with any nausea as well a itching and it will potentiate the codeine too. Really, if you were light headed from 60mgs and you are potentiating it maybe the full pack would be too much. You can always try a higher dose next time..