Mindfulness, meditation and yoga are helping me a LOT with my eating disorder recovery ( 26 years with anorexia and bulimia so no easy task). this book in particular

Radical Acceptance by Tara Bruch

The exercises in the book are helpful to me. Also working on breathing meditation helps. If sitting. Is painful there is walking meditation. Also 20 minutes is a LONG time for someone just starting with meditation. My The suggested beginning with no more than 3 to 5 minutes to avoid frustration.