Is there a word for "extreme disgust"?
Solution 1:
Revulsion would fit.
noun [mass noun]
1 a sense of disgust and loathing:
news of the attack will be met with sorrow and revulsion[ODO]
Although it has a similar appearance and meaning to finding something revolting, it has a different etymology. If you are revolted your insides turn upside-down; revulsion means they are pulled apart.
Solution 2:
There are the terms loathing, defined as:
Strong dislike or disgust; intense aversion.
or abhorrence, defined as:
A feeling of extreme loathing or aversion.
A feeling of repugnance or loathing.