Yes, have suffered and still suffer from heartburn on and off. Most of the tips I've got, have already been mentioned, but can't hurt to mention again.
Eating small amounts, don't drink when you eat dinner/lunch or breakfast, or only a little bit. Sit up for at least 2 hours after dinner. I try to drink as much as possible during the day (about 3 litres, spread out over the day), so I can stop drinking around 6pm, which helped me. As mentioned before don't have food that's too fatty. Also if it could be bub pressing against your stomach, or being in a certain position, try and pat the bump in a different spot, so baby moves away or changes position, this has helped me on several occasions..