is not as such related with Vitamin D deficiency.
To know the cause of dizziness please get the following investigations:-
2. Thyroid profile
3. Lipid profile
4. Blood sugar levels (Fasting and PP)
5. MRI head and neck
Do you have headache along with dizziness as it can occur in some neurological conditions like migraine
Also get yourself examine by an ENT specialist
for other causes.
Hope this is useful.