Anxiety is killing me at work

I hate my job. I'm suffering from anxiety. I literally cannot stop thinking about how much I don't want to be here. Every time the phone rings or another email comes through I feel like puking. I'm so nervous and anxious. I have stuff piled up from last week and I'm tired of asking for help. I have so much to do and I'm so confused on everything that I'm going to have to ask for help but I'm scared once someone sees how much my emails have piled up they'll yell at me. Idk. I just want to quit so bad and go home. I'm applying to other jobs but I'm so scared they're going to be just as bad. My last job was so hard and difficult - working with disabled families in case management. I thought if I can last almost two years there I can do anything. I thought this retail call center job would be a breeze. I was horribly mistaken. My anxiety is through the roof. I'm nauseous all the time. I have constant headaches. When I'm at work I'm dreading every second and when I'm home I'm dreading going back. I'm seeing my therapist tonight with my boyfriend and I'm trying to stay positive but it's so hard I just want to quit now.