How to treat chest pain and stomach ache for four months?

Hello doctor,

I am a 17-year-old, and I have had chest pain daily for the past four months. The pain occurs on both sides of the chest but mainly on the left side. I also feel some kind of pain in both of my hands, like in my arms and fingers, but not in the neck. Along with that, I was also suffering from stomach aches. I went to the doctor and told him my symptoms. The doctor said I had constipation and advised me to take some medicines. And when I asked about the chest pain, he said it was normal due to gas. I returned home and started taking medications. I felt relief from the stomach pain, but my chest pain was still unaffected. I went to the doctor again, and he said that it was due to gas and gave me some medicines. But still, I got no relief. So I visited the doctor again.

This time, he advised me to have a chest X-ray. The X-ray report concluded that bilateral lung fields show prominent bronchovascular markings. After knowing that, I got scared. I did some research on the internet, and some articles have written that it could be related to heart problems. I want to know whether it is related to the heart or not. The report clearly states that the heart is normal in size and contour. But still, it does not ensure that I have no heart disease. Please give your kind advice. I want to be clear about whether it is a heart-related problem. Also, it is treatable or not, and if it is treatable, what is the treatment procedure? Please help me with this. Thank you.