Hello Alan,
Sorry to hear of your uncomfortable symptoms. My husband Tony has some of these but is luckier than most as his symptoms are very mild. He uses a mouthwash several times a day (a "sensitive mouth" one without alcohol in it) and also rinses his mouth with salt water regularly, which his dentist agreed was a good idea. He was told to use a soft toothbrush, so I looked for a soft replacement brush for his electric toothbrush. The only one I could find was a Disney-princess themed one, but he didn't mind: "With all the indignities I'm suffering, this is the least of my worries!".
Don't be too hard on yourself - exercise will help you feel better and stay strong, but keep it to a level that is comfortable for you. This is not for ever, it's just a few months. (Tell your dog he'll just have to be patient!).
Tony also finds that now he knows what to expect at each stage of the cycle it's not so daunting. Like you, he gets very hungry with the steroids, and we're trying to keep lots of fruit and veg handy, so that he doesn't pile on too much weight.
Maybe he's just lucky, but some of the things he's doing, which may be helping to combat the side effects, or the cancer (or neither! who knows?) are: avoiding dairy and using soy foods instead; eating nuts; drinking pomegranate juice and green tea; eating turmeric; eating broccoli and other green veg. And spending time on hobbies that he enjoys, getting out of doors whenever possible.
I'm sure your wife and daughter don't find you a burden and will want to do all they can to support you. They know it's only for a limited time, and hopefully the chemo will buy you some good quality time to spend with them when it's over.
Good luck!
Marje