Im a workaholic - if I dont, who will?

No you are not mad. First thing I did,  when chemo was confirmed, was discuss with my oncologist when I could and couldn’t start because of my work commitments. I think back on it now with a combination of amusement and respect for my oncologist’s patience - he was just trying to save my life. As it turned out, I worked right through chemo - it’s the luck of the draw. Some can, some can’t and there seems to be no particular logic. Most can’t tell which before starting. So plans A and B are worth doing. I didn’t have young children to think of but they are just old enough to understand you may need some help and to discuss ways in which they can do that. Others on the network who have had that experience have offered some really good tips and I am sure can do so again. Now is also a good time to look at what you may be able to turn to if necessary - if your job includes super, can you access insurance? Over planning is a slight pitfall - the tendency is to try and plan the next 6 or 12 months in detail right now! Problem is, you don’t know yet how things will turn out. Taking one step at a time is agony for organisers but it’s also really practical in this situation. 
I was told to take two weeks off after surgery and, reluctantly, planned to do so (mastectomy and axillary clearance). As it turned out, I was fine after a week. Just as easily, it could have been four. People can and will step up, the hardest part is letting them do so. Keep your eyes on the prize, it’s being well, staying well and being with your loved ones. Very best wishes.