Hello Hassan i share your concern Internal bleeding leading to low hemoglobin could be a reason behind your weakness Which can be a complication of typhoid as well In my opinion you should consult a gastroenterologist for examination and an endoscopy or colonscopy as well as blood test for hemoglobin CBC and nutritional assessment for the confirmation of diagnosis you can have multivitamin supplements have plenty of fluids If you can upload me a complete medical history I will be able to help you even better you can write back to me by asking a direct question to me thanks for your question best regards