Welcome to Appeals!
Very sorry to hear what a difficult time you've had.
However, your academic case will be of much greater importance than extenuating circumstances, and the further away you are from the required score, the stronger your case will need to be.
(And if your academic case is
strong, it will raise questions about the extent to which the 11+ was affected.)
Academic evidence, extenuating circumstances, chances of success, etc., are all discussed in the Q&As.
You have a lot of reading to do!
Once you've finished reading, if you still have unanswered questions, do please let us know.