Open Question: Mixed Mood/Episode?

I was seen by my pdoc today and he confirmed that I'm experiencing a mixed mood. I have bipolar disorder and am still working up to a therapeutic dose of Lamictal(I'm at 75mg) Since I've been experiencing some severe depression as well as insomnia and racing thoughts he added a very small dosage(12.5mg) of Seroquel to help further stabalize my moods and sleep. Has anyone had this done to help with their mixed mood? Did it work? If not what did work? Thanks in advance.