As it is, I can only give you guesses.
Trembling of the knees is often a description of fear, so a "knee trembler" might be something scary, like a horror movie.
The only non-medical meaning of "chimera" is "fanciful mental illusion". This may mean pursuing such an illusion. This sould have an article before the noun.
"Black tongue" could be a mild medical condition of the tongue or a normal description of chow chow dogs.