Everyone struggles with bad admin. habits from time to time, so don't think you are alone. The important thing to remember is that you need to make a change BEFORE it gets out of hand.
Below, I have listed 5 easy steps to encourage you to start the change:-
1) Stop procrastinating - just make a start
2) Regroup - analyse what has to be done, prioritise your list, action and get things done
3) Monitor your workload - daily regroup
4) Keep your workspace tidy and orderly - things don't look so bad if you do this
5) Use a daily book rather than scraps of paper to jot the things down that you need to remember
Good luck ... START TODAY