Welcome @kabash. You're sounding remarkably together for this point in your treatment. I can remember veering from despair to fog then back again. Everyone else has given good advice so I won't bother repeating things. By all means, if it gives you some feeling of control (and that's a big thing on this rollercoaster) do keep on with quitting smoking and refining your diet but don't beat yourself up about it if it gets hard - as @iserbrown says, it will come.
Partners sometimes find it hard to cope as their first instinct is to try to fix or protect and your husband can't do this. It is important, though, that he understands what you're going through and that you need to be able to cry. If he is able to, take him with you to your appointments as it will help him to understand what is going on. If he isn't able to go, take someone else who you trust and who is likely to listen and pick up on things. So much of what you're going to be told in the next few weeks/months is probably going to sail right over your head no matter how intently you listen. If you can't find anyone to go with, ask your doctors if you can record the appointments. I also found it useful to jot down questions as I thought of them so that I would be prepared when I went into an appointment.
Take care.
