Sentence:  [S]ome men, nay, even some monks and brothers of this very house, are so envious of my state and foes to my peace of mind, that whenever they see me more happy and fuller of hope than common, they <WSD>vamp</WSD> me up some story or conjure some spectrum to disquiet me and sadden me! 
Meaning of the word marked with <WSD> tags:  To cobble together, to extemporize, to improvise.