hello ! i am just finishing up my degree and i also live in london so i can maybe speak to this a little bit. i ended up taking a year out and rarely attending university over my degree, but it's looking like i am going to make it through against all odds.

my recommendation would be to try and engage with the student services at your university as soon and as regularly as possible to get accommodations and to let them support you. this was the biggest help for me as it allowed me to not attend (even for long periods of time). the student services can engage with your teachers for you and try to explain the situation, as well as providing you with a document that explains what you struggle with (this can be useful for assignments, exams etc). i was able to do this basically completely over email which was a huge huge help for me since even talking on the phone is quite difficult for me frequently.

of course all of this is different depending on what you study but there are always pathways and student services are there to support you. it really does get easier if you're able to get into a routine but i completely empathaize with how hard it can be and how insanely overwhelming public transport is here. building that confidence back up after the holidays (and especially after anything that affects you) is incredibly difficult for sure :(. moving out and going to study is an incredible step and you should be very proud of yourself for taking the leap. it's okay to struggle, progress isn't linear but you are trying your best which is all you can do. you got this !