Thanks for writing in.
Are you on any medications? Certain medications like metronizole etc can cause a metallic taste
in the mouth.
Any history of stress/ anxiety?
I assuming your blood pressure is normal.
Are you using spectacles? Do you use the computer a lot (it could be computer vision syndrome
due to eye strain
Please visit an Ophthalmologist to rule out other serious conditions.
Hope this helps.
Dr. Divya Kuttikrishnan