I started the Calcium Citrate supplements yesterday. The brand I am using is Citracal. They are Calcium Citrate +D3 Maximum. I took my first dose yesterday. About an hour later, I had the worse pain since my surgery. I was nauseated, had elevated heart beat, and after pacing for about 30 mins, I ended up throwing up. I didn't have anything eat after I took the supplements. So I thought may be I took them all too fast. So this morning, I spaced the two tablets (15 mins apart). An hour later I had same reaction to the supplements. Has anybody experienced this? I am looking to feedback from you all on what my options are because clearly the current supplement will not work for me. Thanks in advance!