hello and welcome,
as per the details provided,you are hypotensive.
,headache and dizziness usually occurs in hypotensive patients.
The metallic taste
in mouth may be due to deep dental caries/impacted wisdom teeth which is decayed/throat infection/tonsillitis.
Please do visit a dentist
to get thorough examination.
Grossly decayed(impacted) teeth has to be extracted.
Please do vsit a physician regarding throat and tonsills examination.
Maintain good oral hygiene
diet control is necessary for maintaining blood pressure levels.