Very common!!!
You may have had an anxiety / panic attack that heightened the symptoms.....
Panic attacks come in different forms...Often the ones I have experienced with DP never had palpatations or thinking I was gonna die etc attached to them...Mine were more a sudden attack of Im going to just lose it and I often used to feel like I had left myself mentally...
The other thing people often say is that their surroundings suddenly started to feel odd...(This would be a sudden onset of detachment from everything around them) Instead of just feeling personally detached they start to feel detached from their environment...This is DP graduating into DR....Its all very very common with this condition...
To be honest I never ever underestimate the crap this condition can throw at us at any moment or time...It will create all kinds of weird disturbing symptoms to make you feel even more afraid....
Of course what happens then is the obsessive side kicks in even more and our thinking starts to turn to "This is it....Ive finally lost it" ....Hey presto!! more panic and fear to fuel the DP...
Its all part of the Anxiety, Panic, Fear, DP merry go round we all struggle to jump off....
