C.!!
I'm sorry - I've been sooo busy!! We need to catch up again next week!!
When I moved here from Germany - I think it took me about six months to adjust....when I moved from San Francisco to Belgium? It took me about year - TOTALLY different climate, etc.
I know your house is clean. I'm wondering if it's too clean. Does that make sense? I had a friend in Germany who kept her house ABSOLUTELY SPOTLESS - you could probably eat off the floor. Kids hands were washed with antibacterial wipes, etc. so ANYTIME they met someone new - they got sick as their bodies had NOTHING to fight against normally.
Have you had the house checked for mold? There might be mold behind the walls that you can't see which might be causing some breathing issues???
The other thing to consider is that we have different trees here in VA than in CA...especially from where you come from in CA - not a lot of dogwoods, etc. there...more palms, etc. that makes a HUGE difference.
Go to the allergist and see if you can get tested for allergies...as allergies for SOME people - not all - make them feel sick instead of just the runny nose, etc.