I agree. Had someone describe caffeine withdrawal head aches the worst. I started getting sober headaches recently. I've been sober just over four months. Some mornings I feel like I have a hangover and the headache persists through the day. The headaches sort of came in as the pangs of cravings mostly eased off. Guessing after years and years of abuse, the body is slowly recovering and adjusting itself.
I had an acoustic nueroma removed in 2007 and the nerve damage and palsy it left to one side of my face is slowly recovering as the nerve repairs itself very very slowly. I guess the same applies to the rest of my body now that alcohol is removed. Recovery is a spiritual, mental and physical process and it takes time and never really ends.