anxiety issues !

I have pretty sensitive anxiety would be the best way to put it. People always seem like I over react and get anxious over nothing. I can't help it right now for instance,
I'm having a mini attack now hence why I'm typing this to help ease it. 
So my husband asked me to do his work paperwork for him to take to his bosses because he couldn't be bothered so I did it and he took it to his bosses and called me saying I stuffed the whole thing up, that he never will get me to do his paperwork and that now his boss is missing money. I must of stuffed up the calculations I don't know, it might not seem like a big deal to some but it has set my anxiety through the roof and trying to figure out some coping methods now?