Would anyone have any suggestions to make Zander feel better from this horrible cold he has?

I'm using the baby vicks on him which is working ok, he seems much happier just after I put it on. I've also given him infant Demazin which I don't think really did anything yesterday, but I'm about to give him some cos he just woke up. I have the room heated & we're not planning on going out anywhere cold.

The worst thing is the cough. I just got him out of bed & he started coughing & coughing, poor thing was then dry retching from coughing so hard. The he did this almighty vomit which I could tell was really forced & out of the botom of his stomach.

Is there anything more I can do?