Bad mental health and third year

I need some advice please.
I’m a third year university student and I am feeling terrible. My mental health has absolutely fallen apart these last few months and this has resulted in me not doing so well in my January assignments and now having to redo them in summer. Since then, it’s just gotten worse, I have not done my dissertation or any of my assignments, I have deferred them all until the summer.
I have spent weeks in a constant panicking spiral inside of my head. I can’t get myself to do my work. I was on track to get a first and this is still saveable if I can push through, it just feels impossible. I feel like everyone is done and I am trapped. I am not in a good head space at all. I don’t know what to do.

This was me last year and in some respects still is me. My circumstances last year meant that I deferred almost the whole of my 3rd year until the summer re-sit period with Extenuating Circumstances. I had only achieved enough to pass 1 module out of 5 by the June results period. Immediately everyone else was graduating and although I'd already accepted that this wasn't going to be me (yet) I was still absolutely gutted and miserable that I wasn't joining my cohort on a special day. Anyway fast forward a couple of months and I ended up passing a further 3 modules which I honestly wasn't expecting. My dissertation was a non submission for the year and Extenuating Circumstances allowed me to try again this year. I have submitted it now but I have so many regrets. I have spent so much time fretting and ruminating and generally being miserable, while pretending to everyone else that everything is fine. My advice. Please, please, please don't do this. It doesn't solve anything. Please get help. And talk to people. See if anyone can help you find a study buddy or something. If someone can help you break down all the tasks and help you focus on one thing at a time then it could help you deal with everything that is left in a less overwhelming way. Definitely try your GP aswell as the wellbeing team at the university. I promise you it will be worth it if you can get all of the help and support as soon as possible. Good luck. You can do this!!