i actually only took 6 days off for the double mastectomy.... honestly, i wanted to get on the bike sooner, but my better half was not so cool with that idea. anyway, otherwise, i exercised throughout the entire treatment. every single day of chemo, i rode my bike (except for one short business trip).
does that help? getting out for a bit of exercise every day will help you get stronger and heal up... of course, you don't want to overdo it, but you also want to get moving so that your body can HEAL!
sounds like ANTI-FUN, if you ask me... i'm so sorry you're dealing with that.