Hi BTG,
Cyclothymic disorder can be very frustrating. If your moods are fluctuating that dramatically in a matter of hours, for no apparent reason, you would probably want to have your condition stablilised. Are you being treated for it, and do you have a good support network?
Hopefully someone who suffers from it will come along and say "Hi", so that the 2 of you can compare experiences.
Neverhteless, most people here have experience with mood disorders of some sort, predominantly depression, so I am sure they will understand how you are feeling, and will be able to give you a lot of support.
Best wishes,
Chrys.