My experience may not be at all that relevant to your own, but I'll share it just in case:
I didn't feel well after taking a high dose of the D vitamin from Walmart, "gummy" variety. The placebo effect may have come into play, but the headache and dizziness it caused ruined my entire evening, so I haven't touched Vitamin D since my first attempt of taking it. At first I wondered if it was the amount of vitamin D I took, but later I wondered if it was the other substances in the gummy, being that I get headaches and dizziness very easily when I eat the wrong thing.
Also, keep in mind that vitamin D isn't just a vitamin, but can also be considered a hormone as well:
http://www.ncbi.nlm.nih.gov/pubmed/18689389
Your increased pain may or may not have had anything to do with the vitamin D, but I would continue to listen to your body and go from there along with seeking the advice of your doctor.
Post Edited (CharmCityLady) : 11/6/2013 2:36:58 PM (GMT-7)