Thanks for writing to H.C.M. for your query.
I have gone through your query regarding burning in chest, throat , headache and nausea
. Your tongue is coated and no sinus
issue is there.
Considering your symptoms it appears as you are suffering from acute gastriris with reflux oesophagitis.you are already taking antacids but not getting proper responce. You are now advice to take-
(a) Antacid with PPI (protone pump inhibitor).
(b) Avoid spicy food and take bland diet.
(c) Antiemitic like Domperidone
(d) Take proper rest.
I hope this will help you, but if by above treatment you don't feel happy than consult your physician.