So I have had this diagnosis since October.
PTSD
When I was diagnosed with GAD (generliased anxiety disorder) I didn't believe it as even though I was anxious I wasn't anxious about everything.
So why do I believe this? Because I live it everyday. I would love to move on get a job and forget my bastard of an XH, I would love to sleep without having to take pills every night, I would love to be able to 'nap' now and then, I would love to be able to chill out and go out and enjoy the wasted years on EX but I cannot because my head is wasted with PTSD.
My Mum in particular doesn't believe I am unwell. She tells me weekly to 'give myself a shake' followed by:
Why you?
Your Grandad had depression and was never like you
X split with her exH and isn't like you
You need to stop thinking about you and give yourself a bloody shake and live in the real world 
No-one unless they have experiences it knows how debilitating this is, I would stay in forever if I could. Tbh I would do something with myself if it were not for the DC, then I think they may be better off without me here. I have no friends, my parents think I 'pretend to be depressed'
and my life is shit.
OK I do what I want when I want but that's just it, now I can what I want when I want my head is too messed with anxiety to do so, even my DS1 is a bloody trigger now with his loud voice and they way he shuts doors (slams) and shouts at the dog.
Should I just give up trying to explain myself to my Mum? She blames me for my DC being unwell as I stayed with XH, and now she blames me for making their life shit as I am 'pretending to have PTSD'