Metallic smell from mouth and nose. Cause for this?

Hello,
There are 3 reasons for bad smell in mouth--
1.Dental caries or poor oral hygiene
2. acid reflux from stomach ie acidity or heart burn , in addition constipation.
3. Nasal disease- due to nasal discharge which trickles down there can be such smell.
Treatment-------
1.Dental caries or poor oral hygiene---dental doctor opinion , brush mouth 2 times a day. avoid smoking or alcohol
2.acid reflux-------
Antacid tablet like proton pump inhibitors with domperidom
Syp. antacid gel 2 tsf two times a day half an hour before meals
multivitamin twice daily
Keep head end of bed elevated.
Avoid alcohol, Smoking
Do brisk walking daily
Go for walk after dinner
Avoid spicy food     
Avoid late night coffee

3.Nasal disease--- Get ENT opinion,, examination of nose can be done and if there is any disease then CT scan can be done to see for disease, then further management can be planned.