Personal chat with complete medical history

Yes there are many reasons other than dentistry for halitosis.

Not quite Freshclor mouthwash twice daily for a month

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Do you have dry mouth, improper salivary secretion in mouth. Prolonged use of the drug may cause that which interferes with self cleaning mechanism of saliva >> food lodgement/carious teeth >> bad breath. Take sip of water every half an hour. can be asymptomatic carious tooth with food lodgement causing Bad breath Use Dental floss clean tongue  thoroughly soft bristled brushing twice daily, after food. If not, Do you have acidity and prolonged interval period i.e. unable to take food in short intervals..? If so, correct it and take antacid. Luke warm water salt gargle twice daily. Attach  intraoral clinical picture