It should be noted that everyone handles it differently. I lost my mother to lung cancer 2 1/2 years ago. She made it through the radiation just fine, able to function and go places, but the first round of chemo about killed her. She passed out and they had to revive her and she wound up hospitalized after wards. She never did recover from that.
Chemotherapy is no picnic, and it's not perfect, but it is better than it was. Our scientists are continuing to work to make it better. Pray for them.