Its truly amazing that I havent caught covid with my levels. I think I might have had it but I never lost taste, smell or any of that. I just had a couple of days where I felt crappy and then had a "sick poo". Ive been exposed to it several times. My sister had it in january of 2020 before they had the test. Her doctor just shrugged and told her she probably just has a really bad flu. Then she had me bring her eggs while she worked from home.Low vitamin D can indeed make you feel horrific. I was extremely deficient for years and it took a new doctor joining the surgery to look through my blood tests results and say ‘um, so has anyone told you your vitamin D level is basically non existent?’ I went on 60,000iu for like 6 weeks and have to get another course from time to time. Some people have trouble making/absorbing it from their food or sunlight.