I haven't taken my levothyroxine today. I'm getting a cold, and want to take some Daquil. The drug interactions checker said that taking levo and Dayquil together might cause heart palpitaions and irregular heartbeat. I don't want that, has happened before, and it scares me, and makes me think I'm having a heart attack. Is the levo still in my system? I really want to take the Dayquil, because this cold is driving me crazy.