yes! felt exactly that way! 
you are not alone. i even did a stint in the newspaper business, although it was in the form of being in the journalism school…as part of the photo course i discovered that i LOVED doing stringer work for exactly the reasons you stated above. but sitting and writing…awful.
try the meds. they may be able to help you sit and write. writing is THE hardest thing for me (just finished a masters, unmedicated, talk about torture 
i find that white noise in a headset can help, or at least a sound blocking headset. your work may HAVE to provide that for you as part of acomidations (and yes, in the US – not sure where you are.) also, sounds silly, but tootsie pops help me. i bite my fingernails, and if i have the tootsie pop….i don’t. and i’m calmer. not sure why.
i was also told by a great mentor to only write every other day (which you probably can’t do at a job.) get up super early and write before you do anything else. not good for a job i suppose since you have to get there, but still… see if you can get an editing buddy – someone to swap stuff with to edit.
wait til you meet your boss to be afraid. might work out ok. altho, like you, i fret. easier to say than do
the meds should help. a lot. they alwasy help me. (no insurance right now, so no meds, but i’m hopeful
let us know how you do!!! good luck!
rufina
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