The analyses of a text #3

The narrator recalls his adolescence.
He is beginning a new life as an apprentice in Doctors' Commons at London.
The narrator's best friend Steerforth and his Oxford friends came over to the narrator's apartment to dinner.
After the dinner and the much drinking of wine, they went to a theatre, where he encountered his old friend Agnes and she advised that he had better go home?I think she found him so very drunk.

........................................
They followed, and I stepped at once out of the box-door into my bedroom, where only Steerforth was with me, helping me to undress, and where I was by turns telling him that Agnes was my sister, and adjuring him to bring the corkscrew, that I might open another bottle of wine.
How somebody, lying in my bed, lay saying and doing all this over again, at cross purpose, in a feverish dream all night?the bed a rocking sea that was never still! How, as that somebody slowly settled down into myself, did I begin to parch, and feel as if my outer covering of skin were a hard board, my tongue the bottom of an empty kettle, furred with long service, and burning up over a slow fire, the palms of my hands, hot plates of metal which no ice could cool!
[David Copperfield by Charles Dickens]
1. I think "lying in my bed" is the duplication of "lay."
So I was wondering why there is "lying in bed."
2. I'd like to know if "being" is implied after "my tongue."
3. I'd like to know "furred" and "burning up" modifies "my tongue."
4. And I'd like to know the palms of my hands" is in apposition to "hot plates of metal."
Thank you in advance for your help.