That sounds a LOT like bipolar disorder. The part about rambling and being unable to stop sounds like a manic episode. I'm not qualified to diagnose you or anything, but it really depends on whether you think that something needs to be done. Also, it might be hard to tell your parents at first, but they can be very supportive. Mine were, even though I didn't want to tell them at first. Still, I was able to arrange doctors' visits for quite some time using my parents' insurance, and they never found out. It might depend on the insurance company though.