I am IBS-CG and my doctor wants me to take calcium 1000mg each day. I'm at that age that my body needs more calcium. Anyway I started taking it and after a few days I began to start to feel sick. Is there anything I can do to be able to take this without feeling sick? I take it with food in the morning. However I also take vitamin E and a multi-vitamin at the same time. Could the mixture of all of this cause stomach problems?