I completely understand how you feel. I myself started work as a lawyer in a law firm at the beginning of the year and since then the anxiety and the pressure are killing me. I am not exactly a full-blown laywer like the ones you see on TV I am more like a "support laywer"" - a person who does everything a lawyer does except representing people in court. That's the easiest way I can explain it, as I live in an eastern european country and the law structure is a bit different than that in the US/western Europe.
My point is that since about 6-7 months I feel the way you do every day. Even the smallest mistakes ruin my everyday life, I started receiving panic attacks even when I am not at work, can't enjoy my normal life anymore, started going the a psychologist, thought about quitting my job but due to my life situation that is kinda impossible to do.
On the positive side now, constant anxiety is something you can deal with by using psychotherapy and the right medications and changing your lifestyle a bit.For the past month I started feeling a bit better - at least my desire to not go to work and the constant struggle and fear to do even the simpliest tasks faded a little bit and now I can at least enjoy some relaxing time at home. I still get anxious and feel fear often but hopefully things will get better with time. I am sure you will be able to cope with the anxiety, just make sure to take the required steps - go to a psychologist, start taking some light antidepressants like anything with Passion flower (I found out it helps me), do some exercise, find some hobbies (my psychotherapist says that everyone should have at least 5 hobbies to keep him occupied) and know that this feelings are not permanent and you will get better :)