The other night I took a calcium vitamin, a B-6 vitamin (6mg), and a pre-natal vitamin after I ate dinner. About 45 minutes later, my stomach felt sour and I was somewhat dizzy. It was almost like the feeling you get when you're carsick or hung over. Are these vitamins reacting badly when I take them together. Should I avoid taking them all at once and take some in the morning and some at night, or was it likely something else that made me feel that way?