Hello. So sorry to hear this. My DH is incurable but not yet terminal. His cancer is not treatable. Can't be cut out (too risky), doesn't respond to chemo or radiotherapy and no immunotherapy options available.
We've only been going through this for a couple of years so far, I'll tell you what he has found helpful, as far as I'm able. He's been doing lots of reading and has made some changes as a result. It's all about supporting and boosting his immune system, reducing pollutants, chemicals and hormones that he might come into contact with.
Sleeping a lot can be mental health related, but it can also be exhaustion as the body is using all its energy in trying to repair.
Organic, unprocessed food and natural cleaning products as far as possible and he's cut out any added sugars completely. He also takes supplements, the everyday ones are Vitamin d with k2, vitamin c, and a berrocca daily. There a couple of others he's trying, lions mane is one. He tries them for a couple of months and decides if he'll carry on based on whether he thinks it's made any difference to how he feels. psyllium husk is another daily one. Tries to eat a lot of ginger and garlic.
Drinks filtered water all day. Coffee is decaf organic and swiss water processed. Wine is organic and a mix of red and white. Herbal teas.
Washes with organic soap, and we've switched to the most low chemical cleaning/laundry products we can find. Doesn't use deodorant, just washes more frequently.
Fasting. Once a week for 36 hours, but he doesn't stress if we don't manage it every week so I think it's one of the things that is good if you can but not as important as some of the other things he's doing.
Being outside as much as possible. We live in the countryside so I suspect this wouldnt be the case if we where in the city as it might not be as healthy. If he's inside he'll often have a window wide open whatever the weather. He spends a lot of time in the garden.
Meditation and journalling to support his mental health. Pilates to support his physical health, in addition to our daily dog walks. I think he intended to do a bit of strength training too, just hasn't started yet. If he's got a bit stressed at work he'll do something for that he knows destresses him, like reading.
As much sleep as he wants. I notice a huge difference on the days he has to get up earlier than normal, his energy levels are much lower, more than I would expect to see.
Routine. Doing the same things in the same order and time every day. Apparently it's less stressful on the body and mind and takes less energy.
Wishing you all the best.