I am on week four this week but find myself waking feeling anxious. (Like I did before the pills!) Will this eventually settle down?

On 20mg of citalopram. What does an anxiety attack feel like on the pills or do you just not get them? Feeling a little anxious today about all these things!! Just worrying they not going to work for me....I so want to be anxiety free and not worry the same! It rules my life.