Diagnosed with PDSD

?Nicole? • Mother to an amazingly wonderful 5 year old daughter & expecting bby #2 in September
My so was diagnosed with PDSD & I'm not sure what it is? But sometimes he has these unusual outbursts & some of the time takes it out on me, and It really makes me mad, am I being selfish, should I be comforting him instead of being mad are the outburst because of PDSD? or something else.