Hi: I had severe breathing problems for months before I knew I had GERD. My breathing got so bad that I was treated for severe bronchitis with a few antiobiotics, then steroids, then Advair. I went to a pulminologist, had the asthma testing, and finally figured out that it was GERD. I have been on Nexium for a week and my breathing has been perfect since. The Nexium side-effects though are a real bother: neck, shoulder, thigh, and knee cramping and pain and also a vague sense of numbness in my midsection. Has anyone else felt these, and does anything help?