Thats awful for you mumofloads, but I can relate to it in a way, & its apparently normal post traumatic stress, & I wonder if some sort of therapy or counseling might help you with it
I was locked in a house fire in my early 20s, thankfully I got out safely & unharmed, but a lot of damage done & pets killed, & it felt like it took forever to get out, it turned out to be the result of an electrical fault, I spent the next 2 years dreaming of being burnt alive, & waking up up to 6 times a night & not being able to rest until I'd got up & checked all the plugs etc were safely off (daft really as it was caused by a dodgy light fitting
) it did gradually lessen, in that I dreamt it & needed to get up & check less & less over time, but it still came back if I was under any stress
Several years ago, for other health reasons, I went to see a private therapist for Myofascial release, medically recognised in the US apparently, but not yet properly here....anyway, its very much a physical massage therapy, which made a lot of sense reading up on it as regards after effects of accidents etc, but I was a bit dubious about some of the claims, as regards the bodies fascia storing memories of emotional trauma & it later causing physical symptoms, & that this massages would release these "snags" & you might experience flash backs etc
I'd pretty much forgotten about the fire, but my 1st session had me smelling smoke & coughing violently, & again spent a few days up & checking plugs again
, the Therapist told me it was clearing the blocked memory 
I've never had it again since, even during times of stress