Sure enough, when I found etymology of hypochondia / hypochondriac online, it did not support creation of hyperchondriac for this purpose:
hypochondriac (adj.)Source: http://www.etymonline.com
1590s, "pertaining to the hypochondria," also "afflicted with melancholy," from Fr. hypocondriaque (16c.), from M.L. hypochondriacus, from Gk. hypokhondriakos "pertaining to the upper abdomen," from hypokhondria (see hypochondria). The noun is from 1630s, "melancholy person;" in the modern sense from 1888.
1766, from hypochondria + an unusual use of -osis.
1839, "illness without a specific cause," earlier (1660s) "depression or melancholy without real cause," earlier still (late 14c.) ipocondrie "upper abdomen," from L.L. hypochondria "the abdomen," from Gk. hypokhondria (neuter plural of hypokhondrios), from hypo- "under" (see sub-) + khondros "cartilage" (of the breastbone). Reflecting ancient belief that the viscera of the hypochondria were the seat of melancholy and the source of the vapors that caused such feelings.
But then I suddenly grew curious about this meaning of "chondria" - why should there be a reference to the abdomen in "mitochondria" and what could it possibly mean? Of course, I'd forgotten that mitochondrion is the singular, so the origin of the "ia" ending is due merely to pluralization. Still, it was interesting to see the very different origin which resulted in a facially similar English word:
1901, from Ger., coined 1898 by microbiologist Carl Benda (1857-1933), from Gk. mitos "thread" (see mitre) + khondrion "little granule," dim. of khondros "granule, lump of salt."
singular of mitochondria.
So this is pretty cool and I get to think of myself as a mini-Tolkien for a few minutes.