Ask your doctor to check you for Eosinophilic Esophagitis. GERD symptoms that don't respond to PPI's may be due to EE or other allergic issues. More info can be found at http://www.apfed.org/
Also, have you tried ginger root tea? It is supposed to help tighten the Lower Esophageal Sphincter. To make tea, get some fresh raw ginger root. Cut a 1/2-1 inch chunk off (peel it if you want) and put in a pan with 2 cups water. Bring to a boil, then simmer for 10 minutes. Sip tea slowly throughout the day. Alternatively, you can take ginger pieces raw and eat them, but they're kind-of strang that way.
Gluten & Sulfite Sensitivity, Many Food/Inhalant/Medication Allergies, Asthma, Gut issues (dysmotility, non-specific inflammation), UCTD (Lupus?), Osteoporosis, Anemia, Very Low Lymphocyte Counts (T-Cells & B-Cells), malabsorption/malnutrition, possible Lyme Disease (Igenex Lab IgM WesternBlot positive), etc.
Meds: Pulmicort, MaxAir, Injectable Vitamin B12, Herbs, Nutritional Supplements, Essential Oils, Homeopathy.