Is this anxiety or something else?

Since the beginning of summer I have been constantly afraid of my health. Over the summer I have developed like chest pain, indigestion, im always tired, etc. I went to the doctor in june and he listened to my heart and lung function and told me they were both absolutely fine. That helped for a little while. Now for like the past week or so my chest has felt kind of full almost like there's a pressure coming from the inside. Everything I eat seems to give me indigestion. The chest pain is definately worse after eating but it is also worse when I feel myself freaking out about it. It tends to be on the left side which is what really scares me! I just can't seem to accept my doctors diagnosis of nothing being wrong with me! I never had any of these pains before I started being completely obsessed with every little bodily function I have. I am supposed to go skiing tomorrow but there's a little thing in the back of my head freaking me out about this chest pain. I am 20 years old 6' 4'' and am as of late pretty active. There is no family history of heart disease or anything. I am wondering if I should be worried about anything cardiac or if this is just from anxiety. Should I listen to my doctor???