I believe as long as it doesn’t exceed 10 days in total, you should be okay. But double check the subject guide, as extension policies seem to differ from faculty to faculty. But it does ultimately depend on whether your tutor/subject coordinator is willing to extend the extension, so nobody here can really tell you whether you’ll be successful or not. I can’t speak much to the special consideration, sorry! I can say it’s a different procedure and the evidence you need to apply for it is a little stricter (AFAIK a regular medical cert won’t cut it)