Hi,
Passing stool immediately after taking food is usually associated with Amoebic infection of the intestine. A course of Anti amoebic & anti worm treatment is helpful. The pain which ascends to the chest may be due to gastritis or peptic ulcer. To prevent this problem along with medications (Antacids & antiflatulents) - Stick with Regular, frequent bland diet. Avoiding chilly food, smoking, liquor & contaminated water is must. You need investigations to find out is there any other reason for loss of weight. If there is no specific reason for loss of weight the above mentioned measures will increase your weight as well as relive your sufferings.
Best Wishes

hi obidarachel,

I have read your question,
You are suffering from stomach infection , you didnot mention the type of stool you are passing since it matters in this case ,Generally stool with mucus means amoebiasis and if the stool is loose , it is amoebic diarrhea (pain around the umbilicus(=navel) .The chest pain can also be due to acidity problem that arises due to irregular diet.

So I Recommend you to eat fenugreek (methi) Seed powder after each meal this will cure your frequent passage of stool , take antacid if you feel burning sensation and donot eat spicy meals , follow this procedure atleast for two days.

If you dont feel any difference , take anti-amoebic tabs ,deworming tabs and anti-biotic tabs for a week.
For further medical advice I suggest you to consult gastroenterologist nearby.

Wishing you a good health,
DR.G.Gayatri devi.