Corona affecting gradesWatch
Really if your condition has affected you this much you should have applied for extenuating circumstances or DSA before now to cover stuff like this. Without any medical evidence you won't be given any concessions I wouldn't have thought.
If you do better in subsequent years then the impact is mitigated
If they deign to ask about the poor grades and you can explain, then impact might be mitigated
But really you need to register for ECs and sympathetic marking before assessment
Applying now will result & it’s likely your claimwill be rejected
*However*, at the university I work, students can retroactively apply for mitigating circumstances in the next academic year for a previous one, which might Might mean your exams results could be considered at classification. But you will have to check to see if that is the case.