Welcome Leila and sorry for your diagnosis. it is a whirlwind start and so much to take in.
As to chemo., we are all different and some are able to continue work through chemo. Others like myself have not. Some have reduced hours and modified duties. It all depends on the type of chemo, if you need it and how it effects you during your cycle and how you can manage with the fatigue and being a Mum as well. You do not need a seperate loo...just a lid and flush twice. I also have some wipes for suspect seats...for myself or splashes from myself. You don't have to avoid people on chemo. Just sensible measures, good handwashing and bacterial wipes when out. They say most infections come from ourselves not others.....like your own gut.
I purchased some lovely natural coloured makeup which I wear most times when out and people always say how well I look. I have multiple hats as didn't like the wig much and coordinate them with my clothes. This time of year being cool nobody even realises I have no hair. So loosing hair and being a bit washed out can be concealed for work if need be.
Hope this helps and ask as much as you want. There are lots of people here to help. Make sure you are connected with a breast care nurse who will be a support person and can answer lots of questions regarding treatment.
Kath x