Perhaps the only blessing is that the length of suffering is relatively short. I would be interested to see if the drug actually adds significantly to your life expectancy after your options run out, compared to letting the disease take its course. Saying that you get six months with the drug, does not mean you get six additional months that you wouldn't have had otherwise. When my family dealt with this, we were told that the average time from diagnosis to death was six months. The literature backed it up as well. Perhaps the time to death is greater now, but I would be surprised if it was.
My uncle died of liver cancer two years ago. Time from diagnosis to death was 4 1/2 months. His insurance company refused to pay for some drug the doctor said he could try (maybe this one because it was supposed to be about 3000/month). They told him he would have to pay for it himself. The doctor said it might give him an extra month or so, so he didn’t want to put his family through the expense.