I too managed to continue to work for quite a while during treatment and just stopped going in this past week (about mid-way through treatments). I had planned to also use a VPN client to work from home, but found that the chemo anti-nausea meds induced too much blurry vision to make this practical. I applied for short term disability (which luckily gives me at least half pay for the time I'm gone) and will be on that until the end of treatment.

My white blood cell counts had gotten so low there was talk of stopping treatment. Then, in the past few days not having to deal with work, my white blood cell counts shot way back up. Go figure that resting and staying away from lots of people is helpful. Ha! My advice is to keep working while you can (it's good to keep your mind preoccupied), but AS SOON AS you start feeling a bit down, stop going or at least try to make alternate arrangements. Getting sick and having to stop treatment is the last thing you want to do. Take care of yourself first. Work will always be there when you get back.