You do have symptoms of gastroesaphageal reflux disease (GERD). It is caused by the esophagus not closing properly, so acid moves from the stomach into the esophagus. A common symptom is chest pain, and it does get worse at night because you are lying down. Elevating the head at night will help your symptoms. You may want to get a foam wedge. You can sometimes find these at medical supply companies. Diet can also effect GERD, so spicy foods, caffeine, foods high in fat and or acid, like orange juice, and carbonated beverages should be avoided or limited. Also avoid eating two hours before bedtime.
Here is a website with information about GERD and diagrams:
http://www.medicinenet.com/gastroesophageal_reflux_disease_gerd/article.htm
Zyrtec is normally given for allergies, to relieve itching eyes, runny nose, rashes, etc. Your doctor may have given it to you to help with the shortness of breath.
Some grastric problems can cause you to feel shoulder pain (referred pain), especially inflammation of the gall bladder or bile ducts.
You may want to call the gastroeterologist's office and let him know about the shoulder pain, if he doesn't already know. Ask to discuss your concerns with a nurse there, and let them know you haven't had any relief from the medication. The nurse there may be able to put your symptoms in perspective and relieve some anxiety. Anxiety can make GERD worse by making stomach muscles tighten.
I hope this information helps. If not please let me know.
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If this helped you please click the "accept" button. If not please post further comments or questions...Linda

