Getting angry will only cause more trouble and negative emotions. Instead of getting angry, try to sympathize with the person who did you wrong. Try to put yourself in his or her shoes and try to figure out why the offence has been done. Complaining will not get you anywhere. Instead of counting what is yet to be done, why not just do what you need to do? Start from the easiest tasks and work yourself up to the hardest tasks. You will be done before you know it, without stress or worry.