Im sick from my work so im able to work O_o

What ever happened here? After the raid last night i got an E-mail from one of our clients asking me to fix a thing for him and my deadline is tomorrow morning 08,00. Today i was supposed to jump in on another asigment helping an inventorygroup in this huge supermarket. My working hours should be today from 07,00-18,00. Its total 3h transportation by buss, since its to far to take my bike. so i leave house at 05,30 and come home 19,30. So..what do one do..i called in sick to my boss telling him i have a traction in by back after my bodypump class last night..BUT im able to sit on my ass so ill be working on the other client instead. So i kinda called in sick to be able to work with the other client of higher priority. (better, bigger, government own company that can give me a better and well payed..permanent job^^ ) Sometimes i kinda think that this job has totally destroyed me If you sick u sick not calling in sick to be able to work..uhm..or? So anyway im sitting with govermental statistics atm and i hate the freaking railwaysystem of sweden..to many tracks to monitor :S