As long as you have a written diagnosis & treatment is denied by your insurance carrier, not being in treatment shouldn't matter.

Are you sure you want to pull down all that much more stress on yourself? Jan 9 is just 3 wks away. Surely you'll have your hands full. Or won't you be up to dealing with baby & ADA both?

Your HR is sounding as if they think they can carry on. Do you have any other write-up besides this last one--which really seems pretty foolish?