I do tend to panic sometimes, but I've had it under control for months.
Last night I messed up something in my work (well, in my opinion, the client prevented me from doing my job fully, then they were not happy with the selection of work I provided them. Which, is - whose fault? gah) So I couldn't barely sleep last night because I was so worried about hearing more negative stuff from them (via email) I had contacted them with concerns and offered to do whatever I could to make it right for them.
So today I'm just a ball of nerves. I feel like I'm going to barf :-(
ETA: no less than 3 minutes after I posted this, they wrote to me and seemed understanding and wanted to work something out. ahhhh. the power of blogging!! :-D