Hi Ally,
When I went into the psych hospital nearly two years ago, the doc there said it was bipolar, because I had the depressive episode as a teen. I don't know if I've ever experienced a manic episode, but the reason I was in the psych hospital was for a psychotic break and so I don't know how they diagnosed bipolar.
In all truth, I think that symptoms often overlap with different diagnoses, but for insurance purposes, the doc has to diagnose something.
In your case, it sounds like you think it may be more depression only as you say you haven't experienced a hypomanic episode. And then you're med you are on now is making you feel more depressed? That sounds awful and I'm sorry to hear that your doc is too busy to help you with getting on a correct med that will help and an accurate diagnosis.
The t I saw for follow-up after the psych hospital said that bipolar was difficult to diagnose and that she would need a good history from me. However, I stopped seeing her so I don't know what she would have concluded.
The p-doc I saw after the psych hospital was great. I told her I was feeling more depressed, sleepy and sluggish, so she took me off seraquel (what they had prescribed in the hospital, which helped there because it made me sleep finally), and put me on lamotrigine. However, I still felt depressed (kind of cyclically up and down) and not really "up" for any long length of time (like never for a whole day, for instance). And so now I have been off ALL the meds for going on three weeks because of not having insurance, and waiting for that to get going again through Obamacare, and also not believing they were doing anything to help me anymore. Hence I perhaps want to see a doc and ask about getting on wellbutrin again because it worked for me in the past (on two other occasions when I going through more depression). Wellbutrin was probably part of what helped me as a teen, but at that time, I was so heavily medicated on so many different things, who knows what helped or whatnot.

Well, I hope you can talk to your doctor about all this. It's not really fair to you if he is too busy to do his job regarding your care. Especially talk about the side effects and how they are making you feel. If the med isn't helping, I don't see why take it, because the side effects aren't worth it if they don't help you feel any benefit.