Most people practice by the clock, not by objectives. Golf is the only sport I know of in which the player is his own coach in designing and implementing a practice plan. In order to move away from destructive behavior, first you must analyze your pattern. Whatever your crutch happens to be, recognize when you are using it to excess. You must stop, think, then change your thinking.
Diagnosis comes before prescription.
A race car driver I know tends to become angry when someone cuts him off, so he taps the side of his helmet to remind himself he doesn't have time to get mad when he has a race to win. We not only can have a verbal cue, but a physical one as well. Try stopping to retie your shoe to get yourself more focused. Start your back nine on the seventh hole. A lot of players do come back on the back nine, even Tour players.