I did move to a brand-new house just before symptoms started, so I do wonder if there is something from the construction that could be causing this
Sick building syndrome is a thing, but it's a bit of a rabbit hole. If you try too hard to match vague physical symptoms to vague environmental causes, you could end up like the housewife in that Todd Haynes movie Safe.
Try sleeping in the best ventilated room in the house, maybe. See if that makes a difference.