Well if it is calcium carbonate (calcium bicarbonate is just baking soda, heh ), that's your basic calcium supplement. Calcium can be helpful if you're D but might be a bit more difficult if you're C (because calcium can be constipating). If you are C and worried about your calcium intake, consider taking a supplement with both calcium and magnesium (which has the opposite effect).
Most calcium supplements are sourced from calcium carbonate, and there are lots available (and it's also the cheapest kind). Make sure you take it AFTER a meal because it needs stomach acids to be broken down and it will also be much easier on your stomach that way.
Avoid calcium citrate-based calcium supplements because those have their own acid in them (citric acid - the idea being you can take them on an empty stomach because they don't need stomach acid) - but that acid can be very irritating to the stomach, especially for IBS I'd imagine.
Also avoid anything sourced from bonemeal or anything like that - recent studies have shown that these contain dangerously high levels of lead (they also come from bones from animal slaughterhouses, yuck )
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Re: need help!!
), that's your basic calcium supplement. Calcium can be helpful if you're D but might be a bit more difficult if you're C (because calcium can be constipating). If you are C and worried about your calcium intake, consider taking a supplement with both calcium and magnesium (which has the opposite effect). 
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