Feeling loopy

I've had a sinus infection for the past week and a half and haven't been sleeping well. When I went to the doctor she prescribed me some tylenol with codeine to help me sleep. At first I took one pill before going to sleep, but I would still wake up coughing. On the bottle it said I could take 1 - 2 pills every 6 hours. So, last night at 10 pm I decided to take 2 pills. I'm still feeling it over 12 hours later. I can barely type this post. My mind feels really loopy and relaxed. Who can take 2 of these every 6 hours? I think I'll stick to just one pill tonight.