Tight chest and shoulder cramps

Recently enlisted in the Navy and am having trouble with the running part of my Boot preparations. Before leaving I have to successfully run a 12min 1.5mile. Now for my problem.

The flat around my house stretches about 3/4 of a mile, and I've been using it for my running. Since starting, and now over a month later of three times a week running, I get an increasingly tight chest followed by a stabbing pain in my right shoulder that eventually forces me to quit. I thought these were just signs I was out of shape, but they don't appear to be progressing or fading, they always happen at roughly the same distance every week. Sitting for a bit makes them go away, but if I start to run again the immediately start up.

Quickly running out of time to prepare and am starting to worry about not passing my PT for boot, what can I do to help get rid of these pains? I've done what stretches I've been told and replaced all sweet drinks with plain water to help stay hydrated, anything else? Sorry for the winded description.
 
I just started redoing cardio again today andi had the same problem, i just ran through it andit eventually went away...mine was probably from an overworked chest cuz i did chest ebfore my run
 
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