Sorry to hear you are having such a stressful day! Working on Saturdays sucks. I am struggling with that too. I badly want this finished I just don't want to / can't get into the right frame of mind to do it.
For most people the 1st year report is the first stressful milestone. I remember the pressure I felt for my first year report. As a result I wrote a huge document (20 thousand words) most of which I have now cut out. It was completely over the top, mostly irrelevant but I suppose it helped my thinking at the time.
I have found the longer I've spent on the PhD the less I feel I know, although I think I *must* know more (not sure if that makes sense). I am now trying to revise what I have written and all I can see is inconsistency and gaps I hope no one will notice! Just do your best, you can always develop it later, and hopefully you will get some useful feedback.