Do avoid training when you have a cold! Please refer to this thread: http://www.veganfitness.net/viewtopic.php?t=12286
reading it is cheaper than seeing a traditional doctor.
When recovered, don't run immediately after eating (wait a couple of hours), and be sure to know that stitches appears less and less often the more fit you get.
Wikipedia has a pretty good article on stitches, how to prevent them and how to cure them when you get them. http://en.wikipedia.org/wiki/Side_stitch