like stated in my other post i have been on nexium for 2 months and have felt so much better. now the last 5 days i have had the wierd feeling or pressure in my chest and feeling to burp all the time and my heartburn is back. i thought i have heard of people complaining of medicine quit working. i am on 40 mg of nexium which is a pretty good dose. could it be the mediciine isn't working anymore or it has reached its peak?