I heard an ad on the radio for the new Ricola - Thanks a Million contest. Basically, if you hear someone coughing in public, don't shun them. Instead, offer them a Ricola cough drop. If the cougher is a Ricola rep, you could win up to a million US dollars.
This is obviously one of those skill based contests, but the skill is courtesy. Ricola wins by getting all of this publicity and will never have to give away any money. Unless they hold the contest in Canada or someplace with nice people.
I have found it helpful to do the stretching exercises my physical therapist recommends. Do some core strengthening exercises, such as the ones highlighted at The Mayo Clinic. By keeping your core strong, your back won't put itself in a position to cause that sciatica pain you are having.