I am 42 years old female. I am having left side chest pain from almost 2 years now. Have done all blood tests. Sugar bp cholesterol thyroid all are normal except vitamin D and B12 for which I am taking supplements. I go for walk and walk around 3 km everyday without any problems. I always fear that this pain may be related to heart. I have been to many doctors and they say is anxiety and hyper acidity. I fear a lot about my heart. Don't have any family history of heart problem. How to remove this fear from my mind. Please help me.