Dealing with Job Anxiety: My Struggle to Move Forward

This might be a little long but I need context for my question so stick with me, please. Last year I got my first job as a receptionist at an optometrist's office. I mainly got it through connections but it still felt nice to do something that finally made me feel like an adult. However, that feeling was cut short as I had a huge panic attack and the stress was so much that I walked out. Cut to last week, I finally found the courage to apply for a Job. The boss calls me and asks if I have time for an interview which I was so excited about I stupidly said yes. Not even two questions in I'm stuttering and taking a long time to answer which makes me feel even more stupid so I panic and hit the end call button on him and proceed to break down crying and hyperventilating. My mother was next to me in the car trying to console me but it made me feel much worse instead. I just... I have been taking my medications every day, I have been working on coping mechanisms so why? Why did I panic so easily? I feel like I can't proceed with my life because the anxiety is so crippling, it hinders me from moving forward and I don't know what to do and I feel like this is going to happen every time I try to get a job. If not the interview I will have a panic attack eventually! Is there anyone else that can relate to this? Any advice?