Can one be physically addicted to work?

During a recent 1-wk vacation to a wonderful, my body felt very "off" for a most of the time. Now back to intense working, I feel physically great. 

Has my body formed hormonal rhythms that are optimized around working intense, long hours? And upon deviations...withdrawals??

building /bracket | hosting /greatbooks + /gray | ex-BCG, ex-PHD | poli + phil + econ

My big unc is addicted to work and counting money.
What's his hobby and what does he do on weekends? Go to his office, alone in the whole building, just recounting his finance for the nth time.
Always the number 1 person to appear before everyone else.