Not P but Moby-Dick (9)

[Mike Jing]

The following excerpt is from Chapter 29:

Didn’t that Dough-Boy, the steward, tell me that of a morning he always
finds the old man’s hammock clothes all rumpled and tumbled, and the sheets
down at the foot, and the coverlid almost tied into knots, and the pillow a
sort of frightful hot, as though a baked brick had been on it? A hot old
man! I guess he’s got what some folks ashore call a conscience; it’s a kind
of Tic-Dolly-row they say—worse nor a toothache. Well, well; I don’t know
what it is, but the Lord keep me from catching it.

Does "conscience" here mean "guilty conscience", or is it something else?