Both of my gramma's were hospitalized for similar things, and they pulled through just fine. It may just be COPD (and no, I dont know what it stands for, it's a breathing deal though). I'm sure your dad will be just fine. I'll be praying for him, and for your family.

The coughing and hacking thing could be indicative of lung problems. Is your dad a smoker? It may be something that isnt much to worry about, hospitals just like to make a fuss.