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.