Am I Crazy?

So I have either a stomach bug(Thanks Clara)or ate something funky.I do not like to call out of work because I think it sets a poor precedent,but today was really not an option.Days when I am at work I generally work as hard as I can with one thing on my mind,getting home to my wife,dog and life.I love coming home and generally relaxing,or whatever is in store.Days like today though,as I watch TV,read and nap I really wish I was at work being productive.Is this common?Even on vacation,by Thursday I am ready to go back to the grind.I think that my life has been structured a certain way for almost 20 years and I am so set in my ways that even work is a welcome activity.I even wrote a list today of things to get accomplished at work tomorrow,should'nt I be reading comics and enjoying a sick day?I don't know if I would categorize myself as a workaholic,but I feel like being productive is more rewarding than sitting around.Maybe I am crazy.