Hi there,
A detailed medical and psychiatric history is always needed for every patient.In addition, a detailed mental status examination is also recommended for every case to make a diagnosis and the management of the case accordingly.
Next Steps
There is a need to go for your detailed history and including higher cognitive functions.
Vitamin D can cause low mood but cognitive functions don’t worsen to label it as you have described.
Health Tips
Do take the help of the mental health professional. There’s need to exclude some of the medical illnesses too.