The interpretation of dreams dates back at least as far as 3000-4000 B.C. We know that because the interpretations of dreams were recorded in permanent form on clay tablets. It is thought that many primitive peoples were unable to initially distinguish between the real world and the dream world.
Anxiety might be treated with an anti-depressant or an anti-anxiety medication. Generally speaking, there are three categories of anti-depressants: selective serotonin reuptake inhibitors or SSRIs; tricyclics; and monoamine oxidase inhibitors or MAOIs. SSRIs include Paxil, Prozac, and Zoloft.