Although 'rapid cycling' can occur it is not the usual. One's mood swings don't occur so frequently and tend to last longer than an hour or two in duration. For example I will be depressed for months at a time and my mania has lasted from as short as a matter of weeks or as long as a year when unmanaged/unmedicated.

There are other disorders that could fit your description.

I believe one should never self-diagnose. If you truly feel things aren't right the thing to do is start by having a chat regarding your concerns with your family doctor. S/he will start a referral process to mental health care professionals if they feel it is warranted.

Again, I urge you to avoid falling into the trap of looking for answers. By 'doctor googling' you can diagnose yourself with virtually anything.

On another note.... I see you are in Canada. Mental Health Care is covered by your provincial healthcare plan. Follow the route I gave you above. Once the referral process starts it could take as long as 3 months to get into see a psychiatrist but once in the system you will likely see a psychiatrist more frequently. As long as your are referred to a psychologist for therapy, that is covered too. If not referred therapy is generally user pay. BUT, most employer benefits plan will cover it 100%. I recommend you also check with your employer to determine if they have an EAP (Employee Assistance Plan). This a confidential service (ie. work will not know about it) that can help you by providing resources and setting up appointments.