I presume our friend is an army boy...
My only comment is that old bird MOs in the army like us have ways
of telling if the conjunctivitis is real or fake (of course I
cannot tell you how we do it). We have ways of catching
malingerers, wisdom that is transmitted over the years 
Although to be honest, I don't feel like catching any malingerers
after the way we let off the NS defaulter so lightly. If you are
really stressed and need to take a break from training, you might
be better off being honest with your MO. Most of us are quite
understanding and will grant you a respite withinreason...Better
than that, on occasions I go and speak with the Commanding Officer
to review their training if too many of their men end up with
injuries or are stressed out...