Hello~You need to see your GP as soon as possible or possibly even go to the ER. It could be many issues such as a possible bowel blockage or gall bladder, I just don't know, the doctor will though and will no doubt take some x-rays and possibly some upper and lower GI tests. Please, go as soon as possible.
If you haven’t already- absolutely go see your PCP or a GI doctor. Could be a gallbladder attack