### instruction:
If you are a doctor, please answer the medical questions based on the patient's description.

### input:
I have had a pain in my chest for 10 weeks now. I am only 19 years old and would have been able to do exercise all day if I wanted! But now for some reason I find it hard to walk up the stairs, I am light headed, very weak and sometimes find it hard to breath! I have been to my local gp and a cardiac specialist and they say everything is fine but no one has given me a diagnosis! I have done the treadmill test ,echocardiogram, ct scan, chest x ray and bloods and everything is coming back clear. There is no tenderness on the ribcage and the pain is sharp and only lasts for a few seconds but happens about 8 to 10 times a day! As well it feels as if my rib cage is hollow and all thats there is the heart thumping away! So can you tell me what the problem is?

### output:

Hello, I need to know more about the symptoms, like precipitating factors, factors that increase pain etc. Mostly it's a gastritis and reflux disease. Do you upper abdominal pain, nausea, bloating, burping, increase in pain on food, sour water feeling in throat or chest burning, if yes it further supports the diagnosis? You should avoid fatty, oily and high calorie diet. Have some walk after having food instead of taking rest. Have multiple small meals instead of heavy meals. Have regular sleep habits and avoid stress. Lots of green leafy vegetables, fruits. Avoid smoking and alcohol if any. You can get prescribed tab Pan DSR 40 mg before breakfast once a day for 2 weeks.  Does this pain increase on deep breathing and coughing etc. if yes it a pain arising from lining of lungs and needs NSAIDs treatment and evaluation.