I don't know much about EMDR but I'm a big fan of therapy to work through issues. How much therapy did you try (if you don't mind me asking)?

And yeah, you can be high functioning/on top of things cognitively but emotionally be 5 yrs of age (because emotional development didn't progress when you were a child due to dysfunctional family environment). I found myself in this exact position. Child development as an adult can go very quickly because we are adults. I did a lot of child development as an adult. I think that it is a major part of mental illness.