The aftermath of treatment can be scary. I walked every day during and after treatment. Why? Bescause I did that before. Some days I walked less or slower, because I knew my body was involved with my cure. I napped (15 min) many afternoons, not all. I watched my 7 year old grandson after school several days a week and occasionally on Saturdays, too. I'm not a super hero. I know for me, it is often mind over matter. I kept doing as much as fessibally possible.
I was terrified of lymphedema and had follow ups with a PT specialist to give me the tools help lessen occurances.
I wish you well. Your path may be similar but different but you will navigate it.

Just to add--I often try to tell myself that I can deal with things...for example, you might not get lymphoma but you are prepared to handle it with good PT, exercises, and more if you have to. Sort of hoping for the best while preparing for trouble. You seem like an active involved person--that is going to help you cope!