Following are a number of back-translations as well as a sample translation for translators of Isaiah 38:11:

• Kupsabiny: “I was thinking that I would not again see God
  in this world.
  There would be no day that I would still see people
  in this world of life/living.” (Source: Kupsabiny Back Translation)
• Newari: “I will never see the LORD again,
  I will not be able to see the LORD in the land of the living.
  From now on I will not see people,
  nor will I get to live with those who are now living in the world.” (Source: Newari Back Translation)
• Hiligaynon: “I thought I will- no-longer -see the LORD here in the world of the living-ones, or I will- no-longer -see the people in this world.” (Source: Hiligaynon Back Translation)
• English: “I said, ‘I will not see Yahweh again
  in this world where people are alive.
  I will not see my friends again,
  or be with others who now are alive in this world.” (Source: Translation for Translators)