I'd be inclined to agree with the previous answer - either you drink to excess, which is in effect alcohol poisoning, or your chosen tipple disagrees with you. Try drinking one particular type of drink, and avoid mixing drinks which can cause adverse reactions in the most seasoned tippler. On a lighter note - as far as the motion sickness - that occurs because alcohol erodes the balance mechanisms in your ears, but don't panic, next morning two little men will arrive with hammers, chisels and drills and repair it for you as soon as you wake up!