I totally understand what you're going through. I agree w/ the previous post about trying a new doctor. When you call to make an appointment, ask the receptionist to speak w/ a nurse. That's a good way of finding out if the doctor will actually listen to what you're going through rather than just telling you to "deal w/ it" or whatever. There are so many effective meds. You may just need to try different ones or a combination of them. Also, my doctor told me that you CAN go to the ER/Urgent Care w/ panic attack symptoms if it's really bad, and they'll probably give you xanax or something (I'm guessing there, but you know what I mean). I may sound like I'm all "meds meds meds", but that's only because that's the only thing that has really helped me. I take Gabapentin, which is a somewhat unconventional for anxiety. I've done breathing exercises (still do them), and I cut out caffeine COMPLETELY, and I still have really bad anxiety. A prescription is the only thing that has really helped me in any kind of measurable way.
Good luck, and you've got people who understand and care about you here! xoxo