Hi. I Have Had Gas Bubbles On My Right Side

Hi. I have had gas bubbles on my right side for about 3 weeks, this is common right before my period, however it has not gotten better. It is worse in the morning, this morning the breast area wasn't hurting but between my shoulders. I have a LOT of burping with this. I notice now, if I tilt my head to the left the right side, where the gas pain is hurts worse? Did I pull a muscle or should I be concerned