Hi Jane,
A repaired copy of your document has been uploaded to the following folder of my OneDrive
https://1drv.ms/f/s!AmuIXmFDy-1azRlX2JBMPPp_Nb1x
The errors in the document were associated with images that has been annotated using text boxes such as

Rather than resorting to the use of textboxes, the same layout can be achieved by the use of a table (in this case 2 column by six row, with the cells in the second column merged and the image inserted into that cell and the notations
inserted into the cells of the first column. Here the table is shown with its borders, but they can be remove if not wanted and the column widths adjusted to achieve the desired layout)
In
other cases, where the desired layout cannot be achieve by the use of a table, such as

the "compound image" should be compiled in a separate document and then a screen capture utility such as Snagit from www.techsmith.com should be used to take a screen capture, which can be saved as a single image in the Snagit editor and
then that image should be inserted in the actual document. The separate document should be retained in case edits to the image are required.
If these processes are followed, the chance of corruption of the type that occurred with your document will be far less likely, if not eliminated completely.
Let me know when you have retrieved it so that I can delete it from my OneDrive.