When dealing with a serious illness managing other peoples' expectations shouldn't really be your problem, but, well, yadda yadda yadda.
Catching cancer is a great time to take stock of your own limits (as this will happen regardless), take stock of your relationships, and to figure out where the healthy boundaries are that will work for you right now.
Practical advice on how to take steps to put some useful limits in place, so as to maintain better relationships and a more realistic and compassionate environment for healing.