god,ignore proudnscary, she has clearly never suffered from SPD
and as others have said, regardless of your dh's 'understanding'of pregnancy and all that can go along with it,he should be being kind and sympathetic and supportive
I had SPD in my last 2 pregnancies, with the last time being utterly unbearable - my dh used to come home from work to find me lying on the bedroom floor, weeping and helpless, while my other 2 dc's had to amuse themselves...he would lift me to the bed, bring me tea and rub my back...even though I knew he didn't get the pain I was in,or why I was in it, he still helped me
during my 2nd pregnancy,I was referred to an accupuncturist whch was amazing - really, really recommend this - see if your midwife will refer you
also, as soon as dc3 was born - man,the relief of beng pain free is something I still relish today. Tenderness from episiotomies and stiches - pah! No contest! No kidding. I would NEVER get pregnant again, purely because I couldn't go through that pain again.
I'd suggest you sit your dh down, and calmly explain to him how desolate you're feeling, how alone and upset you are...and do go to your mum's if you're able to get there - maybe that'd give himthe kick up the arse that is clearly needed.
and remember - this will pass. You'll be ok.