I'm on citalopram for anxiety. Have been for 2 yrs now. By and large i am fine - mood has improved massively until I try to come off the things 
But there is one thing that sets my heart racing and brings me to the verge of panic and that is the phone ringing unexpectedly, especially in the evenings. Generally most of our friends call DH or me on our mobiles so landline calls will just be parents, salesmen other stuff like that.
DH reckons it's because dad was so ill last year and that when the phone goes i am afraid it will be mum or the hosptial with bad news. That might be part of it. I think that it's more the feeling that it will be something more to 'deal with' and I often feel I am only just about keeping things afloat as it is.
Does anyone else have this feeling? How do I teach myself to not worry?