Stage IV Lung Cancer

My father started his chemo treatment on Monday (taxol,carboplatin,avastin), he's 77yrs old and thank god one of the most stubborn people I've ever met.  He's very weak, is coughing alot and not eatting very much.  We're trying to make him get up and move around but, it's not working so far.  I'm so scared for him and feel so helpless, help me understand how he feels right now and what I can do that will help him please.