Cold on a summer day

The chill will not go away.

Roasting in the sun,
  sweating in the heat,
    but the cold has sunk into my bones.

Where it has come from,
  I know not,
   it has just found a home.

Symptoms of doubt or failure?
  Silent message of warning?

Something to which I must find the answer,
  if I want to feel the warmth in the winter's night.