mate go to the docs, they are going to give you the best advice and it's free! talking of the docs i need to make an appointment, i just got back from scotland and apear to have lost the feeling to both my big toes?!?
Try improving your hamstring,glute and calf mobility.Sometimes if these muscles are tight they can cause your pelvis to tilt and put a strain on your lumbar spine. Try it out and see if it improves. If not then go to another doc or try a sports physio.If it hurts enough for you to seek out a quack its probably not "nothing".
i get these sometimes. Only if I eat too much before running though for some reason *text deleted*. No its not indigestion, Its called a stitch, and its a pain that changes from being dull to suddenly becoming very sharp, like you're being stabbed or something, and forcing you to stop.
I think if you not eat too much before a run and keep your blood and oxygen going round your body, you should be fine.