Ah hun I just don't know how on earth you do it with 4 wee ones already, you deserve a medal or more. I'm struggling with my DS. My H has taken holidays now to help out & I've got a cleaner that comes for a couple of hours on a Thursday she's a god send.
I hate all the comments too, how many times do you need to tell the same people no its not here yet, does it bloody look like it.
Luckily I don't have SPD but my pelvis was unaligned since having my son, I thought it was SPD but was fobbed off by docs so went to the chiropractor and it was the best money I spent.
Hope that you can try take things a little easier, not too long to go.
Take Care XX