One thing to consider would be gallstones. Gallstones can cause significant pain that radiates upward to the right shoulder or around the back. This pain can come in waves and be accompanied by nausea or vomiting. A simple abdominal ultrasound would help rule this in or out.
If you do have sever reflux it is important to take medications such as prilosec or prevaced as reccomeneded by a doctor on a daily basis as the amount of acidity in the stomach can take awhile to dissipate. Certain foods can aggravate reflux, such as caffeine, nicotine, alcohol, citrus including tomatoes, mints, chocolate, motrin aleve ibuprofen, aspirin and eating and laying down within 3 hours.
You should follow up with your family doctor and discuss your symptoms with him/her to figure out what is causing you so much pain.
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