Reply To: Hi there I was suffering from sudden feelings of being faint, tingly arms, bone pain, feeling flush, and feeling tiered, brain fog, and was found to have a Vit D level of 9 (I'm also darker skin toned) at its worst I had trouble walking around the block without feeling wiped out. I was prescribed 50,000IU twice a week for a month and then 50,000 IU once a week for a month. My levels went up to 30 after two months. And I was feeling back to my normal self and back to normal activities ( like gym 3x a week). Then I was put on a maintenance does of 5000 IU 5x a week. About 3 months after my initial visit, I started feeling the same symptoms creeping back although not as severe. My Vit D levels are now at 45.6. I've tested negative for Thyroid issues and other lab/including vitamin and mineral results look ok. Is it common to feel sick again during recovery process? I'm 37 and generally healthy.