I took two 15mg tablets (box says up to 4) and around an hour later I kept getting waves of feeling really unwell. It's so hard to even describe properly! Dizzy, nauseous and just not right really. It's kind of died down 2hrs later, I still feel unwell and the room slightly spins occasionally. I am wondering if this is actually from the codeine and if that's actually something that can happen from taking it?