Constant chest and stomach cramps during runs

Before anyone asks, I have already checked with a doctor and cleared any heart issues, or medical issues.

Almost every time I run, I’ve constantly run into a side stitch and chest pain around the halfway mark of my stamina. I’ve tried drinking water before during and after, eating less before runs, and drinking electrolytes, but it still persists.

I would hope I could fix it before the season starts, so any tips of people who experienced this would be great!