Mr. Bones and Me, EMS

The biggest question I have from reading the poems by John Berryman is who is Henry? My guess would probably be that he is the depressed alter-ego of John Berryman. It starts in the first poem, where he describes Henry as someone who has lost something, possibly a first wife. He then becomes reclusive and sad, and is angered at how public his sadness is. Henry also seems to be someone who hates what he has become, as seen in "The Prisoner of Shark Island" with Paul Muni. He describes the "Big Ones" who laughed at Henry being unable to understand The Man from Blankley's. And then, "Now Henry is unmistakenly a Big One". Something he seems to regret. During the later poems, it seems that Henry is in the hospital, from what I assume is a suicide attempt. In 74 it says "Henry stabbed his arm and wrote a letter/ explaining how bad it had been/ in this world." Berryman uses language in a way where he seems to mess around with proper grammar, and it seems like he is trying to give an uneducated dialect. An example from "The Prisoner of Shark Island" with Paul Muni is "Funnee; he don't feel so." There are supposed to be some of his oddly placed accents over funnee and feel, but I don't know how to type those in. It seems that he doesn't want the characters of Henry or Mr. Bones to seem particularly intelligent. About Mr. Bones. I assume he means death, possibly someone who has already killed himself (maybe it is the future dead Henry, but I'm probably just putting my own imagination into that idea), and he seems to be something out of Henry's imagination. He says "I have sent my grief away" in 36. Does this mean he has already died?