Eat some meat, eat lots of vegetables, eat healthy fats, cut back on the carbs, get out and work in the sun. Take some time to have fun.
Your body will get what it needs.
As it turns out, if you are sickly and home bound, your vitamin D levels will be lower than someone who is healthy and getting out of the house.
But according to the NIH info, you won't make much if any vitamin D from sunlight for much of the year.