Hi, I was diagnosed w/ vit D deficiency 1.5 yrs ago. My dr prescribe 50,000 IU/wk supp. and I was 2 mos on, 2 mos off during the past year. Nonetheless, my vit D level persistently remains in low 10s, and my serum calcium level keeps rising. Meanwhile, my symptoms get worse and worse - extreme fatigue, body aches, frequent infections, ... I'm so exhaused and frustrated. My dr cannot figure out reason for failure to raise my vit D. Just got another Rx of vit. D and I'm not sure whether taking it will make me feel any better. Can someone share some insights into what is the possible missing/hidden cause of my problems? Thanks so much!