The chances of recovering your work depend on many things, but especially the browser you are using.
When you are working on an update, and click (Re-)Check these updates all the data you have entered is sent to IMDb which runs its checks, then sends it all back to you. At this point IMDb 'forgets' about it; it does not retain a copy of the data. Until you click on Save or Submit IMDb will basically have none of your data.
I use Firefox as my browser, which does a good job of maintaining recent history - including entered data - but even it is not likely to recover the full page after a major crash. I think it is quite probable that you will have to start again and reenter all the data.