Hi Carol,
Some people experience nausea and fatigue from Temodar and radiation. Those are the most common side effects. However, people are able to control these side effects by adopting some lifestyle changes.
For instance, it may help him to be on curcumin. The curcumin will help reduce the swelling caused by the surgery and the radiation. The curcumin will also help residual cancer cells to die.
In addition, it would be best if your husband eats lots of fruits and veggies - organics are best. Dark berries provide important nutrients that will help him stave off side effects.
He needs to avoid red meats (beef, lamb, veal, etc.) as those are not going to do him much good right now.
Processed sugars (including sodas) are a definite no-no. They will not just feed the cancer (whatever the surgery may have missed), but metabolizing the sugar will make him feel lousy.
And getting him walking will help him (if he hasn't been in the habit before now).
There is no reason why your husband's quality of life needs to be horrible during radiation and chemo. The trick is making super healthy adjustments to his lifestyle.
I take from your comment about him not being a "fighter" that the kind of lifestyle adjustments I'm talking about above will be really tough with him. I think you are just going to have to have a "Dutch Uncle" conversation with him and let him know - hey, it's either you do these things or you're potentially going to feel like a wet dish rag or worse during treatment. Ultimately, it's his choice.
I'll be praying for you and your husband as you both work to deal with your new reality.
All the best,
Jana