I’m an ultra runner not a physio but have suffered most running related injuries including IT band. Once you have it there is not a lot to be done other than rest it. In terms of exercise there isn’t a ‘cure’ but you could try foam rolling, scraping (graston) and stretching to ease the symptoms.
Once you recover - and it could be many weeks strengthening the hips and glutes with stretching/yoga/pilates as well will help it from recurring.
Good luck - no magic bullet sadly.