What could be the reason behind this?

With time I have become very careful about everything in my life.. for example, everything has to be done on time. At the exact time. If something has to be started at 4:15, it has to be started at 4:15 sharp. Even if something is slightly delayed, I start panicking. Everything in my life has to be done at the exact time, and everything has to go exactly the way I planned. I get really anxious and furious if something is even slightly out of order.
I was never like this. This has started happening now with time. What could be the reason behind this? Is there some psychological reason behind this?