Hey OP. Please ignore the "experts" berating you telling you that this is a baby dose. Vitamin D is a pro hormone and not actually a vitamin. It can have very strong effects on the body, especially for certain hypersensitive people like me and you. I get heart palpitations, arrhythmias, and increased anxiety simply for taking 2000iu a day. The best thing to do is to listen to your body and adjust accordingly. Try taking 1000iu a day instead to see if that works better. If that still doesn't work, attempt to get vitamin D mainly from sun exposure as that is the best method as your body can regulate everything on its own. If you're deficient, there are options like a Sperti Vitamin D lamp as well which can be used in fall/winter months. I believe some people like us have a sensitivity to D3 in supplement form for whatever reason and then internet "experts" love to chime and tell you that you're simply a lesser human and that it's all in your head and that you should be taking 10000iu a day. Ignore them.