Hello doctor m having shortness of breath from past 2-3 years, I usually feel heaviness in chest after having meal , I feel difficulty in breathing while  climbing stairs, After meal, While walking n sometimes after physical activity , my heart beats  becomes fast during climbing n walking last month doctor suggested for ecg n chest X-ray , both d reports were normal , I heard tat ecg reports are not always accurate it does not show exact prblm , so should I do some other test to confirm , do I really have heart problem??? Please doctor m really tensed help me by replying it will b very kind of u