You've entered that awful time post-treatment where you are just playing the waiting game. At least during treatment, as bad as that can be, you have a routine established and you feel like you are actively fighting the cancer beast. When treatment ends, we felt like "now what?". And kind of just stared at each other. those first few days after end of treatment were so very longggg. But then, we found our new "normal" and the wait from CT scan to CT scan gets just a little easier(we do still suffer terribly from dread the day before the CT). Your Robin has found out for himself how fragile his body is right now. It's a shame that he has to feel so bad, but he wasn't going to hear of it from you, or anyone else. He will now probably take it much easier till he starts feeling better, and he will. It just takes time. Take care of yourself and hold on to the hope that this will all get better.