Reply To: Good morning! A little background to start – I'm a 26 year old female, weigh 206lbs and am about 5ft 5in tall. I have been getting dizzy and have been so drowsy I will fall asleep if I sit for more than about 20 minutes (this includes when I'm driving – I have to pull over and walk for a few minutes almost every time I drive or I will fall asleep behind the wheel). I went in to my doctor and they ran labs and found that my Vitamin D (The test was labeled VITAMIN D 25 HYDROXY) was 13.2ng/mL with standard ranges being 32.0 – 100.0 ng/mL. I am also dehydrated. I guess what I'm asking is how bad is that for Vitamin D levels and what should I do about it? I won't see my doctor until next week.