Christina's right.....don't be in a hurry to get a label because once you've got it you'll never get rid of it, and bipolar is not a label you want---especially if you don't have it.

A lot of doctors are treating depressed patients with anti-psychotics now. Here in the US, both Abilify and Latuda are frequently advertised on TV as adjuncts to SSRIs or even stand-alone treatments for major depression. You don't have to have underlying bipolar to be given one of these drugs.

That may be the reason your doctor has prescribed the Seroquel. Treating the symptoms rather than a diagnosis is a good thing. If you're really concerned about your diagnosis, call him and talk with him about it; guessing at it will just drive you nuts and doesn't solve anything. Good luck with the Seroquel, it sounds like it's helping you.