Let's track back to the visual aid in Chris's post.
What is the opposite of anguish? Don't check Google. I'd say "exhilaration." Not so sure I could come up with that at, say, 15.
What is your answer?
UPDATE: Roget's states: comfort, ease or health.
What is the opposite of exhilaration? Agitation, upset, depression, worry
Let's look at the OED:
Anguish is primarily a feeling of excruciating discomfort. Secondarily, oppressive grief or mental distress. Hmm. Chris needs to put up lessons more often.
I think I'll take issue with the opposite in this case. The other, maybe, or resting state, but not opposite.