"I haven't written anything in four years. I'm sort of dried up"

Thom Gunn's quote suggests that he has actually been fighting with author's block for the past four years. He is feeling artistically drained and unable to produce any brand-new work. This could be due to a lack of motivation, or a sensation of being overwhelmed by the task of writing. It could also signify burnout, where he has actually been composing for so long that he has actually lost the motivation to continue. Whatever the cause, it is clear that Thom Gunn is feeling stuck and unable to move forward with his writing. It is a tip that even the most gifted writers can experience durations of imaginative dry spell, which it is necessary to take breaks and find new sources of motivation.