Vitamin D deficiency - feeling worse after starting treatment

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I'm vitamin D deficient (level of 15 nmol/l when tested last month).

I'm now in my third week of loading dose supplements - 20,000 iu three times a week for 10 weeks and feeling worse than before I started treatment.

In particular, I have terrible backache that's worse at night and stopping me from sleeping. Also very tired.

Has anyone experienced increased pain after starting treatment? It feels very scary and I'm not sure if it's a normal reaction to the high dose or something I should be worried about.

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