I am 50 yr old. I feel light shivering (coldness) particularly in the spinal area two to three times in 24 hrs during which body gets slightly stiff, palpitations increase, feel weakness and anxiety prevails. Got medical check up, blood tests, urine culture, nothing positive found. Took typhoid medicine for 7 days on the advice of Doctor but no improvement but fever is not observed. I am a hypertension patient and take regular medicine. What is the problem? Who to be Consulted? Is it psychological or physical?