I don't expect everything to resonate with you all the time, that would be pretty ridiculous. If you think the writing is as good as ever that's good enough for me.

Can you get somebody professional to get rid of the mold? I mean, I don't imagine that's easy, but if it's making you ill... unless of course it's more than just the allergies (i.e., you have less energy because you have to do a lot more top-down stuff than you did in Shanghai).