Explosive soft stool (not quite diarrhea) shortly after eating. comes very suddenly and unable to hold it for long. causes high anxiety. cause? fix?

See your doctor: there are certain conditions where your gut is malabsorptive or irritated by certain foods or certain conditions where you lack the ability to digest a particular nutrient. when this happens, you can get diarrhea fairly quickly, upon your gut's contact with this food. what that means is you should probably start a food diary and talk about what you find with your doctor.