Hi,
My husband died this summer also from lung cancer. I don't have any siblings or grand children either. It is really an effort since our lives are now so different isn't it? What helps me the most is prayer. I pray or basically, just talk to God every day. I get my prayers answered too which is so nice. Luckily, I'm a writer which that has suffered lately when my husband was so ill. But now I'm anxious to get back to it.
Also with my husband being so ill, the heavy house cleaning suffered too! I still made the bed, did the dishes and fixed meals but the rest got ignored for lack of time. I just cleaned the bathroom thoroughly and it took me two days when I used to do it in one! But, life goes on.
I wish you the best.
PML