I agree with #1 and #2
About iron:
1) Supplementing with iron completely solved my exhaustion problems once I really paid attention to what my body needed during pregancy 2 (I forgot after baby 2 and had to rediscover it on baby 3, but was on it from the beginning of baby 4). During pregnancy 1, I think I took the pills for a while but couldn't handle the nausea. Which brings me to point 2:
2) Practical tip: look for capsules with bio-available iron, not those horrid solid-state iron pills that turn up the nausea and don't actually absorb. I think the capsules brand was Nature's Way. (I had a friend whose doctor prescribed iron pills--but they're no good if she can't keep them down! She did great with the capsules.)
3) Further practical tip: if you crave chocolate, that can mean an iron deficiency (which as I type this, I realize I need to consider again--although I use chocolate as a pain med, so maybe it's not the iron).
This is your very last chance to follow that advice, "take a nap when your child naps." After your second child gets out of the sleep-all-the-time stage, they probably won't nap at the same time ... but for now, gather your sleep while ye may!
Simply can't not fall asleep? put a matress in his favorite playroom, close off the door (babygate? closed door? locked door? whatever he can't get out of without waking you up first), and sleep while he plays.
that's all the wisdom I have ;)
God bless!