You will be fine. I share that, as I was very similar with cancer in my lower rectum.
Bleeding is a symptom but no indicator of the stage so please try to be at ease.
Yes it is an awful road to travel but that is all it is.
And believe me you will be a much more informed (and better) 'mental health therapist' through it all. You will enjoy the basics of life, like birds fluttering around, so much more.
I am in the awful time of having completed radiation (rectal cancers most often have radiation-chemo first) awaiting surgery. Only then will they know for sure what is up. My mind plays lots of 'mind games' of what it might be, how awful I will look, how long will I live....etc etc Such is perfectly normal as is having a huge cry for a day or two. Kiwi guys are not meant to cry so I just pretend I am an emotional Italian like on the movies... Haha
My job situation is that the type of standing, continual walking/moving and lifting required mean't that I have to stop for quite a while. But there are plenty of jobs I can still do. BUTT only with a comfy chair or cushion...LOL. In my case, and likely yours, it is your physical (and mental) ability at each stage that governs work load. I think you should be OK even with working part time through the worst of it.
Bless you heaps
Aged 56 - I feel really young...
Colo-Rectal Cancer T2 N1 M0
March 2018 - Diagnosis
April-May 2018 Radiation+Chemo then a TIA (Minor Stroke). - Stopped Chemo.
August 27th-November 2018 - Surgery and long, long recovery
*Decided to live to 100 as I will get a telegram from Her Majesty the Queen when 100yrs old. I so, so want one.
Am a Salvation Army chap so I complete 'knee drill' (prayer) to the Commander in Chief often. For myself personally this helps me through.