HI Gemma! Welcome to the site and congratulations on the pregnancy.
I think there's a whole thread dedicated to mums due in July, so if you have a look in the pregnancy folder you should find it. A couple of the May mums have been dealing with SPD, so that might be worth checking out, otherwise there's lots of just general chat.
Sorry to hear about the problems you're having getting help, not uncommon with SPD from all I've heard here. Maybe there's a specific SPD support thread already, or you could start one to exchange advice etc.