Beth has a good idea about checking your hydration, though hypnoatremia would be unusual in a beginning runner going 4 miles.  Some dehydration would be more likely.  Make sure your are hydrating reasonably 24x7 (light yellow urine color, clear is too much) and you should be able to run 4 miles at a reasonable pace with light fluid intake.  Eating is similar.  Get a good meal the evening before (don't stuff yourself though).  Maybe try a light snack near bedtime, since you have trouble eating right before your run.

In my experience, your symptoms sound like two things. 1.) You're running too hard/fast for your fitness level. (the side stitch tends to support this)  2.) Possible dehydration.  So, run at 4.5 mph, or 4.7, something a little slower.  And, as mentioned above, stay hydrated, but not overhydrated.

Len

PS Hypnoatremia (also called water intoxication) is too much water/liquid, resulting in diluted electrolite levels in the body, which can cause a number of  other problems.