Omg so itchy

I seriously can't stop itching my stomach. It itches so bad :( I've tried coco butter, coconut oil, benadryly creame, Benadryl, as advised by dr, regular lotion, rubbing cold over the area to try and stop the itch. Nothing helps it's driving my nuts, no rash just very stretched from the boys and horrible stretch marks. My stomach itches even where I don't have them and I'm afraid I'm gonna start leaving marks. I try not to scratch but omg it itches sooooo bad. Any advice?