Lymegirl, you know, it was interesting, the next day I had a terrible headache, incredibly worse Depression and lethargy, and weird bone pain. My vitamin D level is normal (15 points above normal) and I was tested many times repeatedly for parathyroid disease. That's interesting you mentioned paratyroid disease. I used to have repeated PTH levels 3x the normal level, but over the last year the readings have gone back to normal.