I have a recurring fever since 1 month. It increases in the evenings.. No other symptoms and the fever goes down after taking a dolo 650 or Acton-OR Multiple blood and urine tests were done, everything came back negative.. including dengue, malaria, typhoid etc.. 1. CRP Levels are high - 37 2. Vitamin D is low - 10 We have taken on 6L vit D injection last week... Since a couple of days the temperature is agin increasing at nights (max recorded was 100.8) I am unable to identify the root cause Can someone please suggest what should I do ? The following tests were done: 1. CBP - HB:15.7, WBC: 6900, Platelets: 226000 2. Malariya, dengue, Typhoid - Negative 3. FPG: 82 4. T3, T4, TSH - within limit 5. Urine test - all clear 6. CT scan of check and RTPCR - negative 7. Liver and Renal function test - negative 8. Ultrasound of abdomin and pelvis - all clear 9. Blood culture and sensitivity - no growth  - negative