first of all, relax
you got to ask him why he asked you for the meds and PCC. there must be a reason. Are you on CSL? State sponsored? if yes then getting meds/Pcc does speed up things
for the main application you basically give all work related documents tht u gave for assessment. other than that you give birth certificates for all applicants, marriage cert if married, if your spouse is the secondry applicant than all papers (education related) of the spouse. other than these ant translations (if any certi is not in english), affidavits incase u do not have govt birth certificates. IELTS results.
I guess this is it.