It is common for those who use (or even abuse) alcohol to also develop anxiety disorders. This can come from a pre-existing condition where an anxiety disorder already existed, or panic attacks can develop from chronic drinking.
Some people drink to alleviate problems. Things sometimes seem to disappear while intoxicated. The same holds true for problems with anxiety and stress. Having a few drinks (or many) can often relax ones nerves. The more you drink the better you will feel and before long you are not thinking about whatever it was that was making you feel anxious earlier. Alcohol can have a calming effect on your system.
However, the next day you may experience the opposite effect. Whatever anxiety you had the day before is now much worse. In addition to the previous days stress, your body experiences side effects from the use of alcohol (which is also a drug). Shakiness, irregular breathing, headache, and other symptoms often occur. If you were having problems with anxiety the day before you now may find your condition has progressed substantially.
In addition to drinking causing increased anxiety, it also leaves one vulnerable to alcoholism. Once you have gotten drunk to relax yourself it will be very tempting to do it again. Even though you may experience increased anxiety afterwords, you may remember how relaxing it was to have a few drinks. Once you have used drinks to alleviate stress on a few occasions you may already have developed a dependency on alcohol. Your brain chemistry could be changing based on the effects of the chemicals you are consuming.
In short, drinking can cause increased anxiety and if you have a problem with panic attacks or high anxiety you should try and avoid alcohol. The benefits are not worth the risks. Sure, you may experience immediate relief from panic attacks for one night, but the next day it may be much worse.
