Some people can't deal with cancer...they just can't. they put you, and it on ignore, and come back to the relationship when the disease is all gone.
I had several familily members completely sever contact with my during my illness. It hurt enormously, enough that now I want nothing to do with them again. I understand it was a lack of their ability to cope, but it doesn't make it any easier to deal with.
Your emotions are high, so are theirs. Maybe you just need to step away from them for a while. Look after you, and worry about less important stuff later. Right now, everything but your health is "small stuff"
Put it all in the "small stuff" bin, and deal with it when you're ready. Until then...get through the day, then get through tomorrow. Everything else will fall in line
Wayne