I get worse hangovers with NAL also. My head feels all brittle and dizzy and bright lights seem even brighter... ugh. I think it's just the extra chemicals in my system maybe. Another reason they're worse could be that I smoke more cigarettes! I tend to drink much slower on NAL and I seem to have replaced the constant hand-to-mouth motion of gulping down a drink, with the constant hand-to-mouth of chain smoking... go figure (Luckily in Australia smoking will soon be banned in eating / drinking areas, might make it easier to cut down...)