Unless you are in the medical field, or have "expert testimony" from someone
who is, very likely it won't help much to say that and they may even
think you are making excuses.
If you choose to do that, print and bring documented studies
but recovery and serious work towards it seems like best strategy.
By the way, I had the exact same thing happen as what you are describing.
Fine fine fine then wham with a little bit more.
Took it as a sign my body was breaking down and quit for good.
Good luck in court--really hope it goes well for you