It seems very unlikely this was Vitamin D related. 1400iu daily is a relatively low amount. Further, Vitamin D is fat soluble, so the amount you take on a given

It seems very unlikely this was Vitamin D related. 1400iu daily is a relatively low amount. Further, Vitamin D is fat soluble, so the amount you take on a given day will have little effect on your overall Vitamin D status, as it builds up in fat over time. If you were really at the point where you had hypervitaminosis D it would have taken a long time to reduce to normal levels.