My husband was diagnosed with vitamin D deficiency 4 months ago. His level was 20. He took a 50,000 supplement weekly for 3 months. When his level was retested, it had dropped to 19. Although his back and muscle pains have lessened over the past months, is it typical for the level not to rise? He has also developed some throat pains over the past month, not a sore throat, but more of a muscular pain. Can this also be related to the vitamin d deficiency?