My mom is approx. 75 years old. Rencently she has been hot, (no feaver) tired, with chills. She rests and the symptoms will go away. One day she looked like she was going to die, she could only eat 3 tbl spoons of yogurt, a few hours later I gave her chicken noodle soup. She woke up normal but a little tired. This has happened three times within the last two weeks. she has diabetis, hight blood pressure and arthritus. Can you please tell me what could be causing this.