hi there,
i have a love/hate relationship with fittonias, so i can completely understand your predicament. right you are about them needing humidity, so here are a few things you can do about that.
place the
plant in the bathroom or kitchen, near an aquarium, etc., provided the areas have enough light.
mist
plant often (duh, hee hee)
place the
plant on a humidifying tray(a tray filled with pebbles and water, but make sure the
plants sits on top of the water and not in it).
here is some more info for you:
fittonias do best in the shadowless light of a north window. night temps of 65-79 and day temps of 75-85 are ideal. fertilize established
plants monthly with any standard house-
plant fertilizer diluted to half strength.
one more thing(sorry so long), it is fairly easy to propagate fittonias. if all else is lost, you can take a small cutting from the
plant, stick it in water, and within a week or two it will have rooted. you can then
plant the cutting and hopefully grow a new
plant. good thing you have until june so you have some options. best of luck and let us know how it turns out!
I can match it's habitat pretty closely, as far as light. But she never did anything for humidity, which I understand these 
Please help!!!