Hi Nicole,
Although the symptoms you described fit in with Bipolar mood disorder, only a trained professional can confirm such a diagnosis.
That said, has there been any radical changes in your life? Heart-Ache? Loss? Trauma?
Depression (wether manic or otherwise), is for the most part, a healthy reaction of your brain to events in your life. Dr's determine wether these reactions are abnormal through a wide range of criterea and carefull screening.
Abnormal depressive reactions are usually due to an imbalance of the chemicals in your brain that regulate the feelings of depression/saddness/mania. However, severe trauma or events in your life can definately upset the balance.
The major difference is that through counceling and treatment, normal balance can be returned. In the case of it being triggered by an event, the person would then be able to stop taking the treatment/medication once the balance has been returned.
In the case of a medical condition, such as Bipolar Disorder for example, the balance can only be maintained so long as the person takes prescribed medication. Once they stop the medication, the inbalance returns.
The best would be for you to have a nice open chat with your GP. Be frank and open. Your GP knows what to look for and will either prescribe some mild sedatives to address the inbalance, send you for counciling or, if he suspects abnormal inbalance, will send you to a qualified professional for assessment.
For the time being however, you are more than welcome to chat on the forum. If you feel down or upset, it could help you find some peace by talking to someone.
I hope this helps
All of the best
Serath