colors are dancing

[frindle]

Hello. I don't quite understand the underlined phrase below.
The speaker is very angry now.
Is it an another expression of getting angry or something?
Please help. Thank you.



I'm so angry my blood's gone way beyond boiling point
and bright colors are dancing in front of my eyes.

[Rover_KE]

He is experiencing extreme anger or apoplexy, which apparently used to be the medical term for a stroke.

Maybe bright colours dancing in front of the eyes is a symptom of this condition.

Rover