A psychiatrist who I saw three years ago diagnosed me with bipolar and BPD. He saw me once, for one hour. I don't believe I am bipolar because my symptoms don't add up as far as I can see.
In my experience, you can have those 'highs' and not be bipolar. There are some mental illnesses where you might experience highs and lows, even to the extreme, it doesn't mean you're bipolar. If you feel strongly that she's wrong, then I would speak up. If she doesn't listen to you then ask for a second opinion. You are entitled to ask for that.
Bipolar isn't the only illness with highs and lows.
There have been times where I've felt as high as a kite, I felt I could do anything, that everyone loved me. I've spoken to people who've tried ecstasy before and the way they describe their feelings high on that, was exactly how I felt. But, I don't believe I have bipolar because there are plenty of things that don't add up. The BPD in my opinion feels more correct and I've been told by a therapist I was seeing she felt I could have DID. Knowing what I know about myself and my behaviour, past and present, the BPD seems more likely. I'm not sure about DID, but I am certain bipolar is wrong.
Always go with your gut instinct. Anxiety and panic don't necessarily mean mania, people react to anxiety and panic very differently. One person may crumble into a heap on the floor, the next person may run around the streets naked. Who knows, because we are all individual and react in our own ways.
If I were you, I would read up on what she thinks it is, and also what you think it is. Print out any useful info you find, write down everything you feel, any triggers that you're aware of etc and take it all with you when you see her next. Try to keep a diary of your moods and behaviour as well. Sometimes we forget things, become confused, if its all down on paper sometimes it can make more sense to us and our carers.