I can relate to the dissociation. I delete all history of the event, both physically and mentally, or burn anything that reminds me of it, and can easily forget it happened or existed. Anytime I start feeling (usually a 'missing' feeling) that way, I just disconnect myself and move away from whatever triggered it.
I can also trigger dissociation myself by zoning out and staring at someplace for a long time, or playing video games for a really long time, or certain destructive habit I'm trying really hard not to participate in. It seems like whenever I feel a strong emotion coming on I just kind of do it naturally. Sometimes I can't tell if I like or don't honestly. It's been an incredible tool in getting over a ton of people who leave me or I've left, and not dwelling too much on bad things. However, when I'm in that state nobody likes me to be around me because I'm unemotional yet depressing to be around (extremely blunt and realisitic about everything). I also seem to have a hard time processing information when I'm in that state too.
These are definitely some interesting ways to cope, but you're not alone.

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