What natural remedies can fight a 2 week cough?

So I've seen a pulmonologist here and I got checked out so he doesn't think I have anything serious now but if it doesn't clear up in a few weeks he might get me an xray and recommend Antibiotics .

So I'm wondering what natural remedies can fight a cough?

It does seem to be dying down but I'm open to raking stuff that can help clear it up. At its worst be coughing for hours but now it's more sparse. Also seems to come on more at night.

Thanks