joejoe,Glad to hear from you once again. The Sam's Club brand (Member's Mark, Pharmaceutical Grade with Vitamin D and Minerals is exactly the same as Caltrate Plus 600 Brand except it contains 500 mg of calcium carbonate instead of 600 mg. This is what I use most and I can get 300 tablets for $8.99 at Sam's club. If you shop there as you mentioned you should get that brand. (Member's Mark or sometimes they have YourLife Brand it is the same thing. I started taking 1 with each meal. Way back then I tried to watch everything I was eating to ward off an attack. Today I eat any thing I want with not much of a problem. If I eat too much onions or tomato sauce this will sometimes cause some stomach acid which I take mylanta and all better. I don't know if you take any other meds but you need to check the side effects if you do. Also I know you have had the problem for some time and can not get the calcium to work for you but I think you should do the 3 times a day routine for a while until you feel better and the try to cut back. Hope this helps.LindaI take no other meds and I used to take most of the things mentioned on this and other boards. It has changed my life. Good Luck.