I know exactly what you mean! Its almost like you can relive the moment in your head and feel the exact same feelings you felt at that exact moment. I hate it! Here's a small example. Someone that was once close to me passed away a couple years ago, and at the funeral I couldn't remember one of their family members names when introducing them to my boyfriend. I felt so bad, and I got really down on myself, even though I'm pretty sure with what just happened they didn't care at all! But it bothered me for weeks...maybe even months. Every time I would think about it I would get that feeling in the pit of my stomach like you talked about. Again, that's just a small example. Worse things have happened and I do the exact same thing...put myself back in that situation once again and feel all the same feelings. I agree with rise_above...distractions! I don't feel like its the same as "letting go" but my thoughts are that if you can distract yourself enough that you feel better, you may realize that, over time, they're not worth getting emotional over and it's only you that is allowing it to make you emotional. Its still a work in progress for me...but i'm sure there's many things I don't think about much anymore and don't really realize it...like the funeral story