Unable to eat and continuous coughing.

From tuesday my father got fever, from tuesday he still was able to eat and drink but less in quantity. From Thursday the fever was gone but from Friday he was unable to eat and drink anything. If he would drink water he would throw up and continuous vomiting was there, there no solids and no liquids he can take. From sunday he could barely drink water and milk and the fever started to come back 100°-102°. We visited a local dr he prescribed pantocid and zofer injection and lucex forte, pyrigesir 1000mg and moxclav 625. He took the medications and the injection but from yesterday evening he's been coughing continuously, when he tries to lay down it's getting more worse and the cough is very persistent and it's not stopping no matter how many time he takes grilinctus syrup. He never took a solid food from Friday till now. It's only water, milk and few pieces of watermelon he ate till now. Whenever he tries to eat he feels nauseated.  I'm very very worried about his health Dr. Plz help.