My husband has GBM. We are only about 8 weeks into this. it took us a few weeks and a few arguments and tons of tears before we just got on with the matters at hand and into enjoying each and everyday.
Once my husband started treatment he felt better...he was doing something concrete to help himself..I do all the research and question asking at the docs. He lives for each day and leaves the things about the future and treatments up to me.
I think the treatment for your husbands tumor is the same as for GBM. 6 weeks of 5 days a week of radiation and temodar (chemo). My husband is tolerating the treatments very well..just a little tired. He is still working...and is in good spirits. Just google his type of tumor and you'll get lots of information. Arm yourself with it so you can ask the right questions when you talk to the docs.
If your husband doesn't want to talk about nutrition etc....just wait until he is ready..and go for a walk by yourself..I bet eventually he will want to come along.
I had to become my husbands advocate in all of this...so he could focus on things that are important to him.
Hope this helps.
regards, Eve