My wife is also from Bicol Province, a small island called Calintaan thirty minutes Banca ride from the Port of Matnog Sorsogon. Maybe you know it. If not I can tell you that it also has no running water, no motorised vehicles, and until a few years ago no electricity. I have nothing but admiration for the people living there and I love the place. I have been there many times and despite my best efforts always end up "shitting through the eye of a needle" after a few days. I eat fresh fish fried straight from the sea and drink only bottled water and beer. But I guess my body is not accustomed to the different bacteria that is all around me and I get sick as a result despite having a cast iron stomach here in the UK.
Anyway since my wife and two kids have come to the UK back in 2009 I can happily report that their health is fine, but I now pick up heavy colds and flu from the kids that to them only cause a few days of having a runny nose. My wife used to get astma also, this not made any better from the air pollution in the Philippines especially when she moved to Manila. Since she moved here no problems.
As for changing gear I am sorry to say that I have to have an adjustment now and then as I am sure most men do. I try to do it discretley but sometimes my wife catches me doing it and tells me off! Guilty as charged!
Thanks for your great post and I wish you a happy/healthy pregnancy despite all of those bacteria all around you.