Congratulations on your 31 days, I will be there in 6 days also.
I have been getting headaches too. They just started about a week ago, I have them every morning and they last almost all day. I've been wondering about it too, it feels like a hangover headache! I've also noticed nausea (sp?) quite often, especially when I'm active, and sadness, which I'm sure is pretty typical in early sobriety. I have my good and bad days. Great job on the sober time, welcome to SR.