Are you running on a track? You don't have to use a watch for the run/jog combo. I find I get better results by running a set distance then walking a set shorter distance. That way you can see the goal and extend that goal pretty easily. I don't run on a track, so I use light poles to set distance (run 2 light poles, walk 1). You might also consider running somewhere other than a track, the repetative scenery kills me, can't stand the treadmill either. Try running at a park or along a greenbelt.
I would recommend alternating your distance. Have a short run that you can do between the long runs, this will help you loosen up your legs, but not totally drain you. Try something like this:
Su= off
Mo= 2miles
Tu= off
We= .5miles
Th= off
Fr= 2miles
Sa=.5miles
When you are comfortable with 2 miles, step up to 2.5. When you get to 3 miles on the long day, step up the easy day to 1 mile.
Also make sure you are drinking lots of water throughout the day and eating enough. Let me know if you want other ideas. We could take a look at your resistance training too.