Now, that was a bit silly!
I think (but am not the CAA) that they will try to establish whether that incident was only a one off or whether that was the only time that you ran into so much trouble that you had to seek medical advice.
They will have to base that on your story and your GP's report.
It is looking at circumstantial evidence and try to extrapolate for the future.
That is very difficult, and if it is too difficult they could conclude; if in doubt do nowt and not give you a medical. At the end of the day they have nothing to gain from taking risks.
However as I have said I am not the CAA.
The FAA states that you have to proof that you have been drug free for 2 years. Haven't got a copy of the JAR rules.
Good luck with the process.
FD