Hmmmm. So the doctor didn't tell you anything about the pills he gave you? That seems odd to me. I can kind of see the idea of anti anxiety medications helping you with some of those symptoms (heart palp and shakes).

My next thought is, yes I think you would know but at the same time I didn't. Let me try to explain, I've probably had GAD since I was born -maybe even in the womb lol who knows. The point is, thinking back now I realized I've always had anxiety -there are behaviours I remember having as a kid that just scream anxiety. But because I as so used to it, it was just a part of me. I was mega stressed, over tired and a "worrier" but there was "nothing wrong with me". Or so I thought -to me it was just normal. So I think the signs can be there if your looking for them

Another point - I don't get breathlessness with my anxiety or panic. I have everything else but everyone experiences these things differently.

I would call your doctor and find out a bit more about what's going on