Hello, I'm a 21 years old student and about 7 weeks ago, after a long trip by bus, I started experiencing a pressure or a discomfort on my chest( left side) that lasts 3 or 4 hours. I went to the hospital twice and I did two ecgs and two X-rays and they all showed up fine. The pain goes away for three/four days and then comes back, sometimes it starts in the morning and lasts until when I go to sleep. The doctor told me that it is nothing to worry about and that it will eventually go away, but still I am worried. Sometimes this pressure is accompanied by a bit of tachycardia( probably due to my worrying about the it).
Thanks for your help.