Returned from bangkok monday pm with a bad cough and heavily infected chest awful thick expectorant dark yellow usual aches etc as if the flu boots chemist in bangkok airport supplied augmentin 7 day course. day 4/5 still unwell?

Viral: If this respiratory tract infection was of viral origin, antibiotics won't be effective if the infection was only a few days old. However if symptoms exceeded a week, antibiotics like augmentin are helpful as by then bacterial infection has often ensued. However augmentin is ineffective for viral pneumonia. If you aren't feeling improved after another day or two, or if you have fever, see MD again

Persistent : Get a proper physical exam including a chest X-ray & blood tests immediately

Symptomatic Rx: Sounds like a cold. Antibiotics do not help for this. No cure for that but it is about rest, fluids, and time and of course managing the symptoms. Consider decongestants and antihistamines. Cough syrups and drops may be of benefit. If you are a smoker now would be a good time to stop. Ibuprofen and paracetamol will help with the aches. If not improving see your doctor to get checked out.