Trust me, sooooo many of us have felt like we were in a constant, never ending state of panic and experienced the same excrutiating fear as you. I have very similar thoughts when I am panicking: I will feel anxious and panic over the idea that it will never get better, I will always deal with this anxiety, or, when I am already in a panic, I continue to freak over the idea that I am a lost cause. So, I am here with you.
However, there IS medication AND techniques to help you with the anxiety! Antidepressants are more helpful with chronic anxiety, albeit they take several weeks to begin working. Xanax and other benzodiazapines like it are good for once in a while panic attacks. I do not use them. Other people know far more about helpful techniques than me, such as deep breathing and attempting to regain control of your thoughts. Talk therapy is always highly recommended. You can also exercise and eat better.
Trust me!!! You can and you will turn around! You are not going to forever be stuck in a constant state of panic. Even people who have had suffered on going intense panic for years have managed to cultivate and anxious free life with help and therapy.
Your first self help step for today should be ignoring the thoughts that your condition will be permanent. Believe that you will get better, not immediately, and even if it sucks right now it will get better. It is your condition that is giving you these irrational thoughts, they are not realistic forecasts of your situation.