You sound much more advanced at coping than I am, chaotic13, but here are some little things I try:

1) have some caffeine
2) tell people politely that I don't want to be bothered as I am trying to focus (this could be co-workers or family if at home)
3) if I'm working on my computer, I close all the unrelated windows on my screen so I am not tempted to look at them. Such as email.
4) I may close the door to my office if I'm at work. I may unplug the phone or not answer it. I make sure no background noise like radio, TV.