Sick on Zyrtec

I am soooooo sick! I have had this cold/cough thing now for a week. Last night was the first night I took some Zyrtec (prescribed by the doctor) and I think it  made me feel worse. I woke up this morning feeling drunker than a 21 year old birthday girl! I then had to drive Regan to school and by the time I got home I was so drowsy, I could hardly keep my eyes open. I think the Zyrtec made me feel worse than taking nothing at all. At least the past few days I was able to get stuff done, but not today!