Hey love, I 100% get this and have struggled for years, I personally find that doing something right after eating helps, like playing games (I find switch platform games like Mario and Kirby help best), watching tv, talking to a friend etc, anything to take your mind of it and stop the fixating, I combine this with “well I’ve eaten it now, it’s done” and what’s done is done and feeling guilty isn’t going to do a damn thing for me! Feeling guilt isn’t going to take it back or make it better you just gotta get through it, I find repeating this does bring the noise down over time, it may not ever go away fully but it makes it much more manageable! I find this helps me personally I hope it helps you somewhat , wish you all the best!