You have to accept help. This was something I was extremely resistant to do, and was told I'd have to the day I was diagnosed by my BS and breastcare nurse.
BUT... this is the time to be 100% selfish. You have to be, for your own wellbeing and protection. So circle the wagons and play that cancer card very firmly. If necessary get your husband to say no to the people you don't want in the house. You can emphasise that you want to keep things as normal as possible for the kids.
Many people bring their own emotions to your experience of cancer. This is a normal human reaction. But as you've identified, sometimes this is too much for you, the actual person with cancer. You get to say no. This is the time to say no, and yes, on your terms. You are the boss of your cancer experience. K xox