Is this all because of anxiety?

I have depression and anxiety, I used to be ok but one day after working hard in a restaurant under quite a lot of stress and not sleeping much and often going out at night I got a bad cold, the doctor said I had bronchitis, but what really botherd me is that once the bronchitis was over I was left with this heavy, dizzy and drowzy head feeling with headaches, I went to see a neurologue and stuuf, had a CAT scan and everything was fine. That was 5 months ago and since then I'v been thinking almost constantly about those type of sensations I get that causes me anxiety and depression, I am usually afraid when I go out because of my symptoms. Can my symptoms be because of my anxiety? and if yes why does anxiety do that? thanks