"Why am I Still Depressed?" is an excellent book, particularly good at explaining the bipolar spectrum. If you do suspect you may have bipolar disorder, is it important to have good diagnosis as certain medications can cause serious problems with mania, particularly SSRI anti-depressants. If your t is unable to diagnose, you might should seek out a pdoc or psychologist who can. Certainly you need a diagnosis if you are planning on medication treatment.