Healing??

Its been 4 weeks since my dad has ended his treatments....and I see no improvment. Yeah sure, the pain is gone....but when will the healing begin. It seems as tho he is just sitting here and giving up...just waiting to die. He's still not eating much.....barely drinking the fluids he needs. The weight just keeps dropping...his muscles are getting weaker and weaker. All he does is lay in bed all day..........when will this get better?? I try to encourage him to get up and do things, eat, drink...and get better. But its not working. To me everyday gets worse and worse....what do we do now?? The doctors aren't concerened...they say this is normal...but I don't think so. I miss my dad. I miss him hanging out with the rest of us in the living room watching tv....talking...arguing...picking on someone....or making fun of someone....but he's not there. It never feels like he is with us. Where has he gone...and when is he coming back??