Stupidity, stupidness?

I have discovered that I am losing vocabulary again. It happens from time to time. Some periods I really know what to say, and what to write (in essays and such). My English is at its best, at least I think it is at its best. No really, it IS! Mind that it does not say anything if it is that good in general. I have recently came out from such a great period, and now I recognize the recession. It is a problem since I feel so empty and I wonder if it is because I have not challenged my brain for some time. I think I am getting more stupid for every day that passes. It is really bad timing since I am inte the middle of an essay that is suppose to be handed in 20th January. I really hope I recover in time...