Noted your history of severe weakness, pain in abdomen as mentioned, White frothy stools like saliva, need to go home.
All this indicate the possibility of severe colitis
hence explaining all the symptoms.
I would advise you the following in such a situation:
Take plenty of fluids orally, coconut water and electrolyte solution to counter dehydration
and electrolyte balance that has caused difficulty in standing and walking, making you weak.
Consult your Doctor immediately for clinical evaluation and examination, ask for tests of stool and blood.
You will be given symptomatic treatment for pain in abdomen and specific treatment with antibiotics, metronidazole
and as needed.
Take probiotics too.
Take rest till recovered well.
Use only boiled for 20 minutes and cooled water.
Hope I have answered your query. Let me know if I can assist you further.
Dr. T Chandrakant,