Journaling helps me deal with things on my own, and gives me a space to vent.

you can even write "Dear T" instead of "Dear Diary" so you feel more connected to it. And its interesting to read back after a while and study your mood patterns. If you want, bring the journal in session, so you can discuss times where you were having specific difficulties, and talk about how they fall under your general patterns, and how to best deal with them.