From the way you phrased your question, I am assuming you mean that work stuff is invading into your personal time, and not that you're simply working (at work) too much (i.e. long hours). This answer is geared towards the former, but it would help if you could give some examples of "If I concentrate on work, I lose many things in my personal life and vice versa."
For me, simply, work is done at work. If I'm not at work, I'm not working, except in an emergency.
I don't check work email when I'm not at work. To do so, I have to be on my computer, run the VPN, use my SecureID key, and connect to my work computer. Very cumbersome. If I'm not on my personal computer (e.g. at a friend's place), it's even harder as I have to download and configure the VPN software first.
I can't check work email on my phone, and (hopefully, unless my job requires it) never will.
The point is that if you're in the habit of working when you're not at work, you should make it very difficult to do so. If I could check my work email on my phone, then I would. So I don't even myself the option.
Tell your co-workers that you're always reachable if it's an emergency, and they can call you at any time. You'll be amazed at how few "really important" emails are worth calling you over.
There's really not much else. Sure, you'll sometimes be thinking about work when you're at home or out somewhere, but that happens pretty rarely for me. As long as you're not actively looking at anything (essentially your email) you should be ok.