I don't know. I have a good friend who's a decent player. When he had a job he was always b*tching that he didn't have enough time to practice. Then he lost his job, but then he complained that he couldn't play well because he was worried about money.
The point? It's easy to be a victim. Much easier than working and being an owner of your time and soul. Sometimes we accept these distractions as justifications to take the easy way out. We play bad and feel completely justified because we have an excuse so we play worse. It's a cycle that repeats over and over, each time getting worse. Eventually you won't be able to play with a clock ticking. Or a jukebox. Or people watching you.
Nip this in the bud. A good pre-shot routine is key as Dr9ball says. It will help you get grounded and focus on the task at hand. Also, don't shirk the work you have to do to make a shot. That includes your pre-shot routine and thinking about what you're trying to accomplish with each shot.
I would bet that while you were playing worse and worse you were not taking the time and effort to think about each shot, settle into it, go through your pre-shot, feel it on your practice strokes and shoot the shot like you mean it.
Most often I see people, once they have an excuse to be distracted, one-stroking, standing up in the middle of the shot, shooting too hard, looking around while they should be focusing on the shot and shooting WAY before they are mentally ready to pull the trigger. It's just laziness and worse, they feel like it's justified because something happened outside of their control. They have a scapegoat so they are fine. This is a symptom that you are playing for other people's perception of you rather than your own joy and pleasure of playing.
~rc