I think i may be depressed or have bi-polar disorder? i have days where i feel like i am on top of the world and then there are days where i am sad, anxious, lonely, lethargic, uncontrolled mood swings... to name a few. should i seek help?

Generally yes: There are many signs that may suggest depression, such as: feelings of sadness or hopelessness, angry outbursts or irritability, loss of interest in normal activities, sleep disturbances, tiredness or a lack of energy, either weight gain or weight loss due to appetite changes, anxiety or restlessness, slowed thinking, feeling worthless, etc... One's primary doctor or a psychiatrist can help.