Mine are really sore as well Shinee Luckily I can still wear the bras I have, but some advice I got was to wear a soft cup bra rather than underwire, and ti really seems to have helped me a lot. I used to get home at the end of each day and my BBs would be rock hard and so painful They are still a bit sore now but not nearly as bad.

Oh, as for heartburn, I'm not really sure. I drink peppermint tea for indigestion which really helps, but luckily have missed out on heartburn so far [-o<