The first step to get help is to speak to your GP. They will ask you about your symptoms, how long they last, the impact of the symptoms on your life and your family history.
It can help to keep a record of your moods. This can help you and your GP to understand your mood swings.
A GP will not be able to diagnose you with bipolar disorder. They will need to refer you to a psychiatrist who can assess you.
Bipolar disorder can be difficult to diagnose because it affects everyone differently and the symptoms can be the same as other mental health problems. It can take a long time to get a diagnosis of bipolar disorder.