Sorry to hear about your headaches, but I'm glad you posted this. I didn't know that was one of the body's reactions, I've been having terrible headaches.
Re: insomnia, not to be taken as medical advice, but I've been drinking this nighttime herbal tea with valerian and hops, it's helped immensely. You should be able to find it in the coffee/tea aisle of any grocery store. I drink it about an hour before bedtime so I don't have to get up for the bathroom in the middle of the night. I also set my bedtime at 10:00 (which was really hard but totally worth it) and I stick to that during the week, 11:00 on Friday and Saturday and always get up at 6 or 7 respectively.
Good luck and congrats on your sobriety!