hi phoebe, im new around here, and dont know your full story, but though i might offer my comments too!
really sorry you are having such a rough time with local elders. i agree with above comments that the best line is to keep to your story of not being able to cope. i think even a letter or an email, expressing appreciation for their concern would stroke their egos. something like:
"i really appreciate your loving concern, and the help that jehovah offers us through the congregation. unfortunately this world, and my illness, has really crushed me, and at the moment I cant cope. for now even wise words of counsel add to my burden, and make me feel guilty for not doing what i should spiritually. i need time to sort myself out physically and emotionally first. please dont visit or call me - i will let you know when i am ready for your spiritual help. i would appreciate you respecting this request, and hope to be back to normal physically and spirituality one day". if you can bear writing something like that i think they might accept it (obviously put it in your own words!)
i hope you dont see my suggestion as impertinent. i know its none of my business, and not knowing the full situation means it may not be appropriate. just trying to help. hope you can heal, as i am trying to do as well!
christian (or non-christian!) greetings!