I’m a 65 year old male, and twice in the past 3 years I have been diagnosed with having a deficiency of Vitamin D. The condition was diagnosed after I presented at my GP surgery with pain in my bones and muscles, and was successfully treated on both occasions with a high dose of Vitamin D tablets administered by way of 1 x 20,000 icu at the start of 3 consecutive months.
The above two regimes worked perfectly, but I am now suffering from the same symptoms again, and so far - albeit after only two days of self administered treatment - the condition isn’t yet responding in the same way that it did before.
I didn’t quite expect the symptoms to have disappeared completely by this time, but the fact that they have worsened considerably for me in the past two days, is making me worry that something a bit more sinister might be going on - especially due to severity of the pain, which whilst bearable is uncomfortable, and is now in excess of the levels I had before.
My fear now is that I might have made in incorrect diagnosis, and that it might actually by arthritis, but would that explain the somewhat sudden onset of the malaise, which started in my shoulder, but has now spread to both my wrists and hands and both my legs and feet?
Any help that anyone could give me would be very gratefully received.
Vitamin B12 deficiency 
Vitamin D insufficiency 
Idiopathic Erythrocytosis
