Sounds like you've got the typical cycle going on. Extended mania followed by extended depression (your brain's way of recovery from the strain put on it by the mania) and now you're swinging back to the manic side of things.

Like Christina said, follow up with your doc on all these things. Keep a log of somekind so you can keep track of your own moods and behaviors. This can be a very helpful tool for both you and your doc.

Best wishes and good luck.