Stomach pain is usually one of the first symptoms of liver damage. I was getting stomach pain the last couple months before I quit drinking. Dying from cirrhosis is a very slow, painful death. The thought of that alone GREATLY helps me to stay sober.
Eat some food to take away the cravings. Heck, indulge in sugary treats if you have to in order to get through the urges. As far as insomnia, I do take OTC meds for that but I have also found that a couple tablespoons of raw honey and a glass of milk really help me get to sleep and sleep sound.