110% agree with @FLClover re being made to feeling guilty because you may NEED to take time off .... if the shoe was on the other foot, THEY would expecting time off when they were not well ....
You may also like to check out the podcasts by Charlotte Tottman - as she is a specialist BC Counsellor who was diagnosed with Breast Cancer 4-5 years ago. She's had a double mastectomy, stayed flat and KNOWS what we've all gone thru! She was surprised too, at the emotions she went thru herself, as they were different from what she'd 'thought they were' when she was counseling women prior to her own diagnosis. So she 'gets it'. They are very easy listening too. xx
Go to this link, click on the 'list' (it should show 22 tracks) and
start off with No 13 (the first one of Series 1) and work your way thru them.https://soundcloud.com/search?q=charlotte tottman