What Causes Burning Sensation From Throat Till Abdomen?

Iam 67 old male,patient of CAD AP for 15years on 18/03/10 under went CABG feeling burning sensation combined with Pain like feeling right from throat to abdomine while walking and at bed time recent 2D Echo studies conclusion - S/P CABG,dilated L.V normal L.V filling, modarate L.V disfuntion,trival MR/No PAH mild loculated pericardil effusion behind RA Left ventrical globle hypokinesia EP flow 30-40.BP normal- medicanis Cardivax 75,pentop40,atcor40,cardivas3.125,rmistan1.25 and diabetic