G, I think your work is your refuge and a benefit has been positive adult interaction with your co-workers. Now your work has been infiltrated by Chatty Cathey. God save us all from the Chatty Catheys of this world!
I really like Job's suggestion of getting out for periodic breaks during the work day.
If it becomes too untenable, seek a transfer or new position.
Maybe I'll have more ideas when I've been awake a little longer.
xoxo
M 20+ T25+ S ~15.5 (BD) BD 4/6/15 D 12/23/16
"Someone I loved once gave me A box full of darkness. It took me years to understand, That this too, was a gift." ~ Mary Oliver