“I don't just say ‘I've got toothache [a feeling]’, but toothache [a feeling] makes me say this.” (I deliberately didn't write ‘the feeling of toothache’, or ‘a certain feeling.)
  This sentence distinguishes between, say, saying it as an example of a sentence, or on the stage etc., & saying it as an assertion. But it is no explanation of the expression
“I have toothache”, of the use of the word “toothache”.