Thanks for writing your post and sharing your story many can relate to .
It is a long time since I was a student but just reading your words I can feel your anxiety and remember how terrible I felt.
You have two exams and an essay coming up so if we just look at them .
Is there a study centre, counsellor , tutor on campus that you can see who could help you..?
could you go to the library and look up some resources that will help you with your essay.
just one thing at a time. read the essay and make some points .
With the exams , can you try to revise one part say for 15 mins , and make notes if that helps. have a break go for a walk then come back to it.
Try to focus on what you have achieved:
acknowledging you need help.
Look at what you are doing and not what you have not done.
Also by breaking down your exams into small bits of knowledge hopefully that will help you start. if studying with another student helps could you try that?
I hope I have not suggested too much, I just wanted to reassure you there is help available and you can start even when it feels overwhelming.
Feel free to post here as often as you like. There is support here and you are not alone.