At 17 you're still growing up with heavy demands on resources of the body Heartburn is due to wrong eating habits or infections in the foodpipe. Shortness of breath can be due to anemia and headaches and bodyache again due to general weakness

I would advise you to maintain a proper posture and also if there is shortness of breath kindly go to the ER and get evaluated for it. These following lifestyle changes may help: - Don't skip meals, you may not feel like eating but in such conditions you should have the reduced amount in frequent intervals(i.e. 3 square meals broken down to 5 or 6 as you can tolerate) and slowly increase as you get better. - Reduce/ Avoid spicy,fried, fatty, junk and oily food - Exercise regularly - Increase daily intake of water to 3liters - Avoid/Stop smoking and drinking - Reduce stress through methods such as yoga/meditation. If there is persistence or worsening of condition kindly visit the ER at the earliest.