Have you gotten your blood work done? Alcohol leaches our bodies of vital nutrients like B vitamins (B1 especially), magnesium etc. Deficiencies in those areas can prolong physical symptoms. Blood sugar can also get really messed up. Be sure and eat regularly and hydrate like crazy. Electrolytes can be way off.
Caffeine can also make, at least me, crazy in the beginning. Anxiety and shakes etc are far worse.