eighth draft writers block??

Hello and welcome to AW and the n-f studio.

First of all, congratulations on securing an agent and being close to getting published.

Not knowing much about your book or how you've been asked to change it, I can only throw out some general kind of advice.

I would suggest that you try to split the changes into small chunks, much in the same way you might split the initial writing into small chunks. This could be done in a number of way.

For example, if the changes requested are of a general nature (e.g. 'you need more facts', 'you need to be more personal'), you could split it into making this overall change chapter by chapter (or section by section). If you have a deadline to meet, you could split it down to spending 2 days on Chapter 1, 2 days on Chapter 2... etc.

Alternatively, if you have a long list of changes, you could split it down into dealing with one request at a time - again, try to make a schedule using the deadline you have (or create a deadline yourself, if you haven't been given one).

If the changes require you to do some extra research, you could equally split that down into chunks. For example, do Internet research for 2 days, local library research for another 2 days, academic library (if you have one you can use) research for another 2 days. Then you could split your notes down further (e.g. by chapter; by topic; etc.) and write each new paragraph or section bit by bit.

To sum up, then: split the changes down into manageable chunks and set yourself a schedule/deadline for each chunk. And keep to that deadline (that might be the hardest part).

Good luck!