Feeling Down and Scared

I am still sick with this awful asthmatic bronchitis. I have asked my doctor how long this will last, and he can't give me a straight answer. I have terrible chest tightness and pain underneath my breastbone, bottom of my ribs, and around into my back and neck. My doctor doesn't seem to be concerned, which maybe is a good sign? I have emailed him a lot, and I have a lot of questions I want to ask, but I feel uncomfortable because I know I come across as annoying. His answers have gotten shorter and shorter, I think he is trying to send me a message. I don't know what to do, I feel very uneasy and I am worried that this is something much much worse. I don't seem to be getting any better, I feel stagnant. I don't want to feel this way anymore. The shortness of breath triggers me to panic and there is nothing that can be done about it, apparently. So, I guess I just have to sit and suffer with this...........for who knows how long. I am debating on whether to see a new doctor, but since kaiser has all the medical notes and emails in a computer system, the other doctor can see everything. I'm worried he will become bias toward me too and just write everything off as being anxiety. I have never been sick like this before and I have had anxiety disorders for over 7 years, you think they would believe me when I say this is different than my anxiety? I just feel so down, I can't do anything but lay around the house because I get winded. I don't know how much more of this I can take.