Hi Georgia and Welcome to Depression!
hmmm... Depression is a horrible "disorder" which can take control of peoples lifes to the point where they can no longer function. Classic symptoms include a decreased sex drive, inability to concentrate, a feeling of impending doom and the classic "Black cloud" feeling. I am not sure what is causing your depression but usually it is either a particular event/series of events or a chemical imbalance. If it is an event/series of events then usually people will try talk therapy along side meds such as effexor, paxil, prozac etc... If it is a chemical imbalance, then people usually take a med which falls under the umbrella of SSRI's. (Selective Seretonin Reuptake Inhibitors). Very basically, when your body secretes SERETONIN into a nerve connection the spare stuff is mopped up. But in depression, too much is mopped up and the body is left short and SSRI's stop that happening.
I hope this is the sort of info you are looking for.