If you have a bad raction to spicy foods you can probably reduce this by eating some stewed or non-asidic fruit about 30 minutes before you start mnching on them. This may also work for nuts. It is often a matter of what state your stomach is in before you start eating the problem foods.

As far as the booze goes, don't drink anything too cold. Also the rate at which you absorb alcohol will change slightly depending upon what else you have in your stomach.

Overall, try not to shock the system.