Academic work should always be marked with the names sealed off where possible to prevent this type of thing.
It is more difficult to be biased in STEM subjects because the student either knows how to do something or they dont. In that context, bias will have a marginal effect. I imagine in the humanities, bias could be disastrous.

In the wider world, bias is actively encouraged and can be a good thing. We are all encouraged to network for example. People buy from people they know. Who you know can matter much more than what you know. I have been on both sides of that.
Of course we can debate about the fairness of that but the cold hard reality is that life is not, has not and never will be built on fairness. Being the "best person for the job" doesn't really make sense for the vast majority of jobs if you think about it.

Anyway, I am waffling. For grading at university, bias has no place and there are easy ways to prevent it.

Yes I must admit to thinking the same thing as ToL when I saw your post.
Did you make any attempt to be proactive about this? Did you make enquiries about any deadlines or responsibilities on your own part regarding each module or did you expect them to tell you everything?
If it's the latter then you are on dodgy ground here I think.
If it is the former and you have an email trail or suchlike and all other students had the same problem then you may have a strong case.
Either way be prepared to be asked the reasonable question of how someone at your level allowed themselves to get so close to a submission date without checking up with the course leader. This sort of thing really should be getting checked on the first week of the course.

Your old degree is irrelevant now in comparison with your current MSc. I would list the grade but I certainly wouldn't bring undue attention to it. It was well over 20 years ago now anyway.
I went through the same process. A 2:2 when I was younger and then a Masters when I hit my 40s which wiped that old degree out entirely.

What you need to do is buy yourself some time to think.
I have two suggestions.
You could either consider self employment as another option or you could temporarily take a stressfree menial job to cover your bills for a few months.
Right now it sounds like your current lifestyle is not leaving you able to think clearly at all.
You have a 50 to 60 year active life ahead of you assuming you are in your twenties. You are allowed to stop sprinting from time to time.

I included the title in my references to help with this.
I wouldn't say I ever learned all 300 plus references inside out as TOL managed but I could look at each title and recall the reason I was referencing it.

Yes.
It took my university 4 weeks to post my thesis and only did so when I chased them.
I graduated in absentia and they didnt send my certificate until I pestered them for 4 weeks by email.
They lost my address and then apparently lost the bloody certificate and had to reorder it.
I was about to make the trip into the university itself to have it resolved face to face on Monday but received a text from DHL on Friday to say it will be delivered to my home on Monday.

In my experience large companies are absolutely stuffed with employees who are a complete waste of space. Universities are included in that. Never be afraid to chase them or escalate things if they start hiding behind emails.

Nothing beats being genuinely interested in and believing in what you are writing.
I always try to write with the principle of "right first time" in mind. For me, the idea of having to heavily edit a 270 page thesis is a nightmare.
I start with a series of headings and sub headings, progressing until each section requires only a few pages of text. That gives me the overall structure. Anything which requires a structural overhaul would give me sleepless nights. After the first draft, I expect to only then require a few days or a week or two perhaps on minor revisions. Occasionally a 3rd revision of very minor touch of an hour or two is required if something has been missed. All of my published papers required no more than this before submitting to the journal. My thesis required a 3rd draft as described above. My first draft took about 4 months to write 270 odd pages and another 4 weeks of relatively small changes before submitting. For me, that attitude of "right first time" meant everything was relatively pain free (with one exception). Mind you, I genuinely enjoyed writing it. I hated doing the revisions.

One thing I like to do is to imagine I am actually saying the words to a room of students.
I found that helped me to clarify my writing when describing difficult concepts because I could imagine the students asking questions.