About 2.5 years ago I started with the Couch to 5K program to impress a girl. She turned out to be a waste of time, but now I run 3x/week, and I've never felt better. I used to have trouble sleeping, but now I sleep like a rock. I used to feel fat and gross, and now I feel clean and healthy. In the last 2.5 years, I've run 6 half marathons and hundreds of miles to train.
When I'm not training for a half marathon, I run for 30 minutes max. It's enough time to warm up, get the heart rate going, and let my mind zone out. I've worked through so many problems -- professional and personal -- while I'm in "the zone", and honestly, I've never felt better. Running isn't just a physical workout; it's mental therapy as well. The endorphins make you happier, the relief of having completed a workout makes you excited to do it again, and the results speak for themselves.
If you're not physically active at all, I highly, highly recommend the Couch to 5K program (just Google it). I used to hate running, now I love it. Give it a shot. I believe you can do ANYTHING for 6 weeks -- and this is no exception.
My next plan is to start working on strength training to build a little more muscle in my core. I'm starting with a body weight training regimen, so I don't need to go to a gym. (I hate gyms.) The upside is that a stronger core will help me run better and faster, with less chance of injury! And faster means more miles in 30 minutes. Just an all around win/win situation.
Finally, for some non-running advice, I'd say leave work at 5:30 every day and don't check your email when you get home. In my experience, there is nothing that can't wait until 8:30 tomorrow. Did you get an email at 6:15pm? They can read your reply at 9am. Did you get a bug report at 4:45pm? Unless it's critically breaking your app to the point where it's unusable, then it can wait until 10am tomorrow.
Put in your 8 hours, then go home and relax.
Good luck.