I hesitate to express opinions on recruitment, simply because my own experiences are now 40 years out of date.
@janner is right, your first port of call should be your AFCO.
However, when I went through the process, you could have as many goes as you liked provided that (a) you were still within the age limit; (b) a naval medical officer hadn’t ruled you permanently medically unfit; and (c) AIB hadn’t ruled you out completely.
@Ninja_Stoker may be able to explain how things have changed.
Sent from my iPhone using Tapatalk