What Causes Abdominal Bloating And Pain?

Hi, I have had a very painful stomach every night after dinner for about a week now. Its bloated and painful and then i spend the whole night passing wind which smelly really bad. I dont eat meat, very little dairy, no gluten, no alcohol, I eat a very clean diet and usually go to the toilet normally twice a day, however I have barely been to the toilet in a week and when I do it feels like it comes out so slowly and I think am done and Im not. I have had repeated episodes of this over the years but this one has been the worst.