Sounds like u may have excess acid and the bread is absorbing it.....see ur PCP or a GI dr for further eval.
In the meantime avoid acidic foods, like tomato, spicy foods as well...coffee, soda....etc....
Do not lie down for 3 to 4 hrs after eating...elevate the head of ur bed....see the GERD forum here on MedHelp for more tips.
http://www.medhelp.org/forums/GERD-Acid-Reflux/show/333?camp=msc