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>If anyone knows how to cope with this kind of failure let me know because I don't know what to do and certainly I could use some life advice right now.
Don't give up unless your supervisors explicitly tell you that things are hopeless. The situation is almost certainly far better than you think, you're just overwhelmed by the scale of the task ahead of you. Postgrads almost always have a massive crisis of confidence at some point, if not several. Everyone I know in academia was at some point convinced that they were doomed to failure.
Marathon runners often hit the wall at about the 20 mile mark, but the vast majority of them find the strength to finish the last six miles, even if they stagger over the line with jelly legs and blurred vision. You're not trying to break any world records, you just need to cross the line.
Have you discussed your concerns about your case studies with your supervisors? What is their opinion? There's probably something useful to be salvaged from them, even if it isn't what you originally intended.
I think that at this stage, there are two reasonable routes to take. If you feel that you're completely stuck and your existing work simply can't be shaped into a satisfactory thesis, you need to get an outside opinion. Speak to a fellow student or a member of faculty, get them to read your existing draft, talk them through the challenges you're facing and see what their take is on the situation. The great Alan Kay once remarked that "a change in perspective is worth 80 IQ points", and rarely have truer words been spoken. A fresh pair of eyes can often give you the insight you need to get unstuck.
If you can see a route forward but you're overwhelmed by the scale of the task, then take a chainsaw to the elephant and turn it into bite-size chunks. Plan out what you need to do each day to meet your deadline, then focus only on each day's work. Forget the deadline, forget the word count, just crack on with whatever you've got planned for today.
Accept that you might miss your deadline or produce a less-than-perfect thesis, but press on anyway. You've got nothing to lose by giving it the full beans now; even if your chances of success aren't great, your chances are zero if you don't do the work.
Be kind to yourself. Presenting a thesis is always scary and you've got a lot of hard work ahead of you. It's OK to be scared and it's OK to feel like you're not going to succeed. Avoiding the thing you fear is a natural response, but it's not a very useful response. You don't have to suppress those feelings, you just need to acknowledge them and do the work anyway. Recognise that it's a horrible experience for practically everyone, but that you're strong enough to get through it. Think of all the shitty experiences in your life that you've survived - this is just another item on that list.
If you haven't already, have a chat with your student support service. They will have heard your story a hundred times before and you'll probably feel better for getting it off your chest.