I have Rheumatoid Arthritis, and I am 27 (I have had it since the age of 7). My recent blood work just came back showing very low Vitamin D levels, even though they were normal 3 months ago. I have to go on Vitamin D treatments for the next 16 weeks. I am just nervous because I have not been feeling good lately and I don't know if there could be something else going on. Can anyone help with some insight?