I’ve never posted here before and I’m not really sure what I’m looking for. Maybe some advice or solidarity.

tl;dr - started a new placement and can’t get rid of the anxiety surrounding it

I’ve just started a new placement as part of my degree  and it’s going terribly. I’m scared to do anything without checking with someone to see if it’s right, and I can tell I’m becoming annoying to all of the people I’m around. I have to check and double check everything I do in case I’ve got something wrong which means every task takes me 10x longer than it should. Even with all of this I’m still making such stupid mistakes which I then can’t stop thinking about, just berating myself for how stupid I am. 

I’m constantly anxious. Whether I’m at work or not it’s the same dark cloud looming over me and I am really struggling to see how it’s going to get better. I’ve completely lost my appetite because I’m always so anxious for the next shift and I can’t sleep well at all which just makes me more likely to make mistakes because I’m so tired. 

I can’t think about anything else, I’m a horrible person to be around at the moment because I’m either complaining about the job, or going over and over my worries, or holing myself up in my room to stop myself being annoying to other people. I just don’t know what to do...