Welcome, kris!

I can understand how you feel. Many wish to get to the bottom of what they are experiencing. As Miguel'smom asked, it would be good to know if your therapist will be communicating with your psychiatrist. If you want that, you may need to sign some kind of release for your therapist to do so. That could be helpful for your psychiatrist, who is just getting to know you. I think that if your psychiatrist jumped to a firm conclusion about a diagnosis, that it would be unwise. Some psychiatrists like to see a switch from depression to hypomania/mania before firmly diagnosing bipolar disorder.

BethRags made a good point that mixed states can often confuse doctors. The line between depression with anxiety and bipolar mixed state can be fuzzy. As risky as it can be, starting off with an antidepressant alone can help make a bipolar diagnosis more certain, with a switch. I guess as long as your psychiatrist is carefully monitoring your reactions to your meds, a change can be made (including diagnosis), quickly.