Help! I am a huge Vitamin D3 fan, but I am having a hard time sticking with it. I have suffered my whole life from SAD and have started using vitamin D (after many attempts at SSRI and using a lightbox). I KNOW this is going to help me. When I started taking it the first time, I felt so different and knew that if I could get the right dose, I would be a whole different person (in the good way of course). BUT...when I take it I am getting wicked side effects.

1) I am getting a "blunted" or brain fog feeling by the evening, no matter how much I take. (between 400iu and 5,000iu)
2) I feel disconnected and sometimes jittery and edgy from it.
3) After a few weeks on it, my elbows started tingling whenever I put pressure on them and sometimes even at night. (I have had tendinitis for a long time and it doesn't seem to be improving)

I am dying to get back on this (during the winter) so that I can really start to benefit from its amazing healing power...HELP!