Hi Salsa,
Around theses parts we call that "runner's trots". I started running seriously in Jan, and I got them all the time. I do not get them/it any more unless I push really hard. I checked with all of the local runners, and they have all had it.

Back off a bit and ease your way in to the sport. I started out too hard, too soon, running with my hubby and ended up with ITB and the baaaddd stomach.

It will go away. And it is an awesome sport.

Ruth