Actually my problem is I always have fear of having heart attack lungs problem like big diseases running in my mind. Symptoms - chest tightness, breathing heaviness , tiredness from 2-3 months. All of these symptoms are not regular it occurs sometimes. I have done blood sugarthyroid test but all are normal.. Pleasehelp me to overcome from the fear of these. Cz whatever symptoms I read same start happening to me from next day and I become more anxious.