Ooh, very nice. The rhyming here was very good, as was the word-choice.
"tired as I am, I know that I am weak
I can't sit or stand, nor can I walk, or speak
My eyes have sunk a little deeper in my head
My skin as pale as the living dead"
^ This stanza was my favourite. Especially those last two lines.
"For once I'm glad I do not weep
Over secrets I'm forced to keep"
I would suggest changing 'I'm' in the last line here, to 'I am', as I think that would improve the flow.