What Causes Stomach Cramps After Having Food?

I seem to be having bowel movements all the time. Every time I eat I start getting cramps and have to run to the restroom. I go anywhere from 5 to 8 times a day. Sometimes more. I don t feel bloated but I do always seem hungry. I recently started taking Nuez dela India off and on for weight loss which seem to make my bowel movements more frequent with more cramping. I went off of the Nuez dela India about 2 days ago but am still experiencing frequent trips to the bathroom. I feel like I m tired and run down all the time and i just want to sleep. I have zero energy. I take a multi vitamin daily and fish oil supplements. I eat a banana every day and yogurt. I m just wondering what you think it might be