[PSY]

As other members have already stated, only a mental health professional can diagnose you. If you suspect something is wrong, then by all means, schedule a visit with your regular doctor! Your doctor can run various tests to help rule out hormonal/chemical imbalances and other dysregulations that might be causing these mood swings. Your doctor can also refer you to a mental health professional.

"Rapid cycling" can occur with bipolar disorder; however, shifts from manic to depressive episodes (or vice versa) wouldn't occur within a matter of seconds. So I definitely wouldn't assume you have bipolar disorder because your mood swifts within a matter of seconds - that could be due to a number of other things, some of which may be diagnosed by your regular doctor.