I think the thing is that specialists are trained to treat their little piece of the pie, whereas GPs take in the bigger picture. Some specialists are better than others of course. I dislike feeling 'handled' and don't ever feel like that with my GP, but sometimes I do with specialists. I get that you have to be careful delivering bad news, and difficult information in complex scenarios. I also understand that some patients will manifest a side effect from worry alone. It must be challenging to know which patients can handle which information. It would be best to know your patients better I guess. But how can you do that in the sometimes incredibly brief slots you get with the stressed and worried people who come to see you? The best specialists are the intuitive ones who are good with people. Sometimes people skills do not go hand in hand with medical brilliance...
Arrogance is not remotely helpful in these situations and it is most arrogant indeed to dismiss your symptoms without taking note and enquiring, and then trying to alleviate them. You simply can't be the only person in the world who has reacted like this to Herceptin! I wonder if your onc ever researches if anyone else has had them? Do they ever take note? Or so full of their self worth and simply convinced of being right? Hmmm, you could always seek a second opinion...
Hope you feel better soon. K xox