The word "apocamnosis" is not a commonly used term, but it is spelled according to its Greek origin: "a-po-ca-mno-sis." In IPA phonetic transcription, it would be written as /ə.pɒ.kəmˈnoʊ.sɪs/. The "poc" element is pronounced with a K sound, and the "mn" cluster is pronounced as a nasalized "m." The ending "-sis" is pronounced as "sis," with the stress on the second-to-last syllable. Overall, the spelling of "apocamnosis" follows the rules of Greek word formation and is pronounced accordingly.
Rapidly induced fatigue.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.