Hii, Welcome to HCM and thanks for asking your Query here As per your medical history your symptoms are most probably related to Food Poisoning as you ate lots of sea Foods recently high possibilities of Gastric Intolerance and food allergies are also there It is important to drink lots of water and electrolytes to stay hydrated drink fresh fruit juice and avoid junk foods as well as over eating and heavy meals i would strongly suggest you to see Your GP because Persistent Diarrhea should be treated as soon as possible as it can leads to severe Dehydration , so you must visit your Doctor ,he will check you thoroughly may go for some medical investigations to rule out any infection present I hope it helps Thanks and get well soon And