Talk to General Physician on Blood In Stool

Hello, this question is for my mother, I hope I will get help from you all. It all started 3 days ago when my mother ate spicy food. She normally eats home cooked food with less spices. First, she got caught up by diarrhea where she felt intense pain in stomach and suffered from loose motion with 103° body temperature. Now the temperature is under control but she is loosing blood whenever she goes to the toilet to pass a stool. She feels like vomiting every time after that and also feels the fatigue. Please help us in identifying the issue and by suggesting a good doctor in Karachi. Thank You.