its worth talking to your doc about it, i definitely would mention it in your ESA as the more you can put in as to your inability to work the better chance you will have, especially if you later mention it to your doc and get a definite dx, they may wonder why you didn't mention it in your application/assessment.
dissociation can really screw your emotions, it has taken me 3 years to master just about holding it together in public, though i still do not manage it when i get tired, hungry or have to really concentrate! (lost it in the supermarket today, impatient idiots expecting me to move my mobility scooter out of the queue i had been in for an hour at the checkouts so they could pass. I never have worked out why people buy six months worth of food shopping when the supermarket is only closing for one day!) sorry, thats my rant for the day!
good luck with everything and do tell your doctor.