APB11,
CASA medical are a pain in the arse atm!
I believe the current delay for initial medicals is approximately three months unless you can put some urgency on it... I.E. impending job starting within a month! (fictitious or not)
As for the MRS, your DAME will have to write off everything that you put in here. Put it in as best as you remember and have a good answer when with your dame. This part becomes time-consuming more than anything. Be careful about saying you have Panadol or Neurofen as even once every week or two could cause additional testing.
Not that I would ever suggest lying to CASA, but the opinion of tell them as little as possible is an industry standard for a reason!