feels like air bubbles running up my left side near my heart

Hello everyone,
So ive been on the cambridge diet for a while now done well lost quite a bit of weight. so ive got what feels like air bubbles running up my left side near my heart and a bit lower??? ive also got constipation at the minute i used to get the bubbles before the diet every now and again but would go straight away. ive had this these all week. i do drink a lot of carbonated water so i thoought it was that so i stopped but its still here. im pretty sure its nothing to do with my heart cause im still here lol but i when its near my heart i start panicking a bit. ive checked my pulse when it happens so its not heart pulpatations. any ideas???