LIVING IN PAIN

I have lived with GERD for about 10 years now.  I am 42.  My doctor finally put me on Nexium which worked wonders for me.  But now insurance won't cover Nexium.  I have had to try Protonix and Prevacid.  They neither one work for me.  But insurance makes me try them once a day for 8 weeks, then twice a day for 8 weeks, then try the other prescription for once a day for 8 weeks, and then twice a day for 8 weeks.  I have a constant cough which I read somewhere could be from GERD.  Meanwhile, I am living in pain. I'm sure that I have erosions back on my espogaus again. They saw them with an endoscopy within one week of being off of Nexium. Now they want me to do an impediment test, which will have a computer on my side, with tubes going from my nose, down my throat, into my stomach. I believe these tests are costing more than the Nexium would.  I don't understand why when they find a medicine that will work for a patient, that insurance will all of a sudden say, we won't cover that any longer, rather than put the patient through all this pain and suffering.