My husband of 19 years was diagnosed with stage 4 gastric cancer this past March 09, he is 49 and I am 47, we have 3 children ages 26,18,and our only son,Ethan 4.Perry(my husband) has been going through the most aggressive chemo and it is taking its toll. He has gone from 210lbs to 138lbs in 3 months. Our 4 year old son cannot understand what is happening to his daddy. I have tried to explain to him as gently as i could about cancer but he just covers his ears and screams, he says " mommy,just...