ikoysss
Regarding the medical issue, you probably have to refer to EK recruitment team, I think they have their own doctor for approval, i can't really put my fingers what illness can get away.
It seem a lot to go thru at first on papers, but once all are done, I realize they all pretty basic physical health check. If you need time for other treatment, then maybe you can postpone your joining date, becos EK allows 6months to join, you can even choose to join later given date within 6 months. i hope this help.