Still tired and helpless

I woke up this morning, complaining about the pain in my throat for having a dry cough. My husband then went to the pharmacy to get me medicine. He got home and prepare breakfast. I took the medicine and before the breakfast was ready, my eyes wanted to close again. That is because my husband bought a Nighttime Cough/Cold Relief which made me drowsy after a few minutes of taking it. Right before we finish breakfast, I went ahead to take a nap because I can't help my eyes from closing. I took a nap for over 2 hours but I am still feeling tired. Uh! I hate this feeling, really helpless.