It caused hypercalcemia, which was miserable. My case was mild and I feel really bad for people who have a case that is worse than mild! I had lots of GI symptoms but the worst for me was feeling like I was going crazy. I mentioned that I have anxiety but it's more like a slow burning anxiety that's always simmering. When I had vitamin D toxicity and hypercalcemia, my anxiety made me feel really, really agitated (which isn't typically normal for me) and jittery. I also felt like I couldn't think straight or express myself effectively.

My thyroid was also off during that time period (hyper - not sure if it was related to the hypercalcelmia) and I didn't think my PCP had a good handle on it so I begged for a referral to an endocrinologist. He ran some of his own labs, looked at my medication list and figured out instantly that my vitamin D oversupplementation was responsible for everything! He adjusted my dose and it took awhile but I got my calcium and vitamin D back to normal. I'm so thankful I insisted on that referral.

It turns out my PCP wasn't looking at all my labs - this could have been easily prevented! I don't see that PCP anymore and I always get copies of my labs now. "All your labs are normal" sounds great in theory but if your PCP is incompetent, it doesn't mean much. I verify everything.

It sounds like you're doing the right thing by getting your labs done every year! Getting me at the right level of vitamin D has been difficult in the last few years so I get tested every 6 months. I'm on 3000 day now, which seems to be the right dose. Hope this helps!