I've been working on this document fine when I had 13pages but it missing some links , then I added others pages ( 29 totally) with heavy pdf files that I reduced the display performance, everything seems fine when I was done but this morning Indesign tried to recover the document but it taking a while and not responding at all.
How much RAM and spare hard disk capacity do you have?
If you can open the document Save it as an IDML document, rename it and open it again in InDesign.
If you can't open the document, divide it in half and see if you can open that half if so, divide the "bad" half in half and continue until you (hopefully!) isolate the issue, which may be a corrupt font or image.