How to manage my bad anxiety attacks

Hi everyone. I just need tips on how to manage anxiety. I had a anxiety attack around 3:30PM and went away around 6:30 I usually have to lye down as I feel paralysed to do anything. I get racing thoughts and it’s hard to calm myself I do breathing exercise and grounding techniques like name things I see and what I hear. But it just doesn’t work. While I am work I can’t lye down there I just can’t focus. But my work easy I don’t need use my mind. So when I’m at work I’m at work I get really bad anxiety attacks I just have to scan items and pack peoples groceries in their bags. But I’m thinking in the future of doing an office job how will I focus when I need to use my mind to do work. How will I manage. I hate the anxiety attacks that I can’t handle I feel like crying I need a cure I want it to go away. I can’t manage working more hours I just am doing 3 days five hours shift sometimes I do 7 hours. I need to get a handle of my anxiety so I can work more hours. I wanted to know are there others who have successfully managed there anxiety and work more hours. How did you do it any techniques please share