Based on the context and the answer, generate a question. 

Context: I cried on my way home because I have just been waiting for so long to do it . We had to do these physical tests in order to get certified and I failed the 200 yard swim . ~_~ I was almost there , but it was the first time I 'd gone swimming since ' 06 and I got water up my nose and had been rushing . FAIL .

Answer:

I have to try again for the certification .



What may be the cause of my sadness ?