Dear Amrat, you haven't mentioned which exam you are talking about. Sorry to hear your situation but if you aren't appearing for the exam, it will not be counted as an attempt. So if you are worried about losing an attempt, you needn't worry about it. On the other hand, if this exam is held once a year and you are at the risk of losing a year, well, it is scary. But nothing is more important than being healthy. Get well and take a call.