Do it mindfully. Do it well. Enjoy the satisfaction. Then go on to the next thing. Multitasking might work for computers, but humans have yet to get the hang of it. It leads to careless mistakes, shoddy work and unreliable performance. Worst of all, having to do things over. This is no way to live. Give what you're doing your undivided attention. Take the time to get it right. And enjoy the experience. Why make yourself crazy?
Now I realize how wrong I am, I always treat myself a computer, I am always busying with something, this is why I feel so tired. I know I'm driving myself crazy. Oh, god! I must make some changes!
I promise myself I will do one thing at a time from now on, I won't be a computer anymore!