messed up my Cambridge interview

I feel like I interviewed very badly. I was so nervous, I was shaking and could only remember the basics of topics I could normally talk about for years. It was very frustrating, and I can't stop thinking about how I could have answered things better- for example there was something on my personal statement that I could have talked about in good detail, but I failed to direct the conversation to it. I got a couple of the tricky academic questions right first time, and I talked about the more general questions well (comparatively), but I did terribly in one section (don't want to specify) and I feel like the second interview went awfully. I enjoyed both interviews, so I don't feel like it was a total disaster, I just know I could have done better. I don't want to shift the blame, but I recently developed a chronic illness and can feel the effect it has on me. It slows me down, it makes me nervous, it makes me unable to think clearly and i hate it so effing much. Do you think they'll understand how much my chronic illness was affecting me? How can I stop obsessing over this?

(ps: I'm sure I've been rejected and am planning on re-applying next year, when my chronic illness shouldn't be bothering me so much. I will not elaborate on what's wrong with me, but I was in pain for the whole interview and was exhausted.)

Edit: thank you everyone for ur kind words! Best of luck for decisions day xx

Edit 2: delighted to inform you all that I did indeed get an offer!! I'm leaving this up in the hopes that it'll comfort 2021 applicants who feel the way I did. Now just praying I meet my offer!