Are you getting enough vitamin B12? Some people don’t, but that deficiency can cause anxiety.
Symptoms can include:
- Depression and anxiety
- Diarrhea or constipation
- Fatigue, lack of energy, or light-headedness when standing up or with exertion
- Loss of appetite
- Pale skin
- Problems concentrating
- Shortness of breath, mostly during exercise
- Swollen, red tongue or bleeding gums
- Confusion or change in mental status (dementia) in severe cases
- Loss of balance
- Numbness and tingling of hands and feet
See more here, here, and here.