I meant to add more, but cannot edit it now. Hence, I am replying again below:

Regarding GERD or any reflux, it is better not to drink too much of any liquid (even water) with your meal. When you have a full stomach adding liquids makes the liquid rise up the esophagus and causes GERD etc. Avoid spicy foods and eat small meals many times. Sip a small amount of liquid at a time after the meal. This should help.
As for shortness of breath, chest pain, etc., talk to your doctor about pure Oxygen therapy. Also, the breathing issue may be due to some problem with the lungs - X-Ray, CT imaging of the lungs and pulmonary function test will identify the problem and then suitable medication may be prescribed. Do you have other medical problems and are taking medications? These can cause pulmonary, cardiac, and/or other medical problems.
Good luck.
ps: The above is based on my current experience.