What Causes Mucus In Stool While On Brat Diet?

i have had diarrhoea for at least 2 weeks, i am drinking at least a bottle of kaopectate every day and nothing has stopped, been following brat diet, have been noticing a lot of mucous/foam in my mouth at odd times, sometimes feels like i am drowning, now I have intense pressure in my vagina area feels like my rectum is tryin to come out there