Thank you Jennie and Cheesebiscuit,
I've now written to them to ask about transferring courses within the University but to another campus. I just hope that is possible this late in the semester.
Thank you again for all of your advice everyone. I just want to bury my head in the sand (well, Sussex anyway) but you are all right -- I can't just hide from the situation.
P.S. please stay safe everyone! (even in broad daylight, with other people around)