I agree. Contact your PBO and let him/her know that your in the IDES and that when in the IDES the likelihood of you returning to duty is slim as even found unfit and you want to stay with a COAD packet your Chain of Command has to approve it. So being in the IDES you could be fully retired or separated with severance pay.
so for your duties, contact the PBO/BN S4 like ebateman mentioned. The Commander should be very worried because with this IDES if you are found unfit and you receive orders to retire/discharged it's not a good thing as a Commander knowing you are gone and they'll have to figure out where all their shit is located and not know if things are missing or just hidden.

There is no requirement for you to push off the Soldier for Life requirement and any medical appointments just to do an change of supply inventory because they waited til the last minute. if you have a good relationship with your Readiness NCO or Training NCO you could see if they would do a change of supply inventory with you then you show them how to sub hand receipt everything out. This would put the responsibility on the Officers/NCO's that are signed for the Commanders equipment. From what my past IDES Officers/NCO's have told me this is now MY time to ensure that everything is in place for me to retire out. The Army will be here for life and people come and go. We cannot afford to miss something in this process (medical) just because we are attending a Warfighter, going to AT or other type of FTX. Everyone's PEBLO's should have told you that while in the IDES process you are to do no FTX's or other training events in the event you get hurt you will not get to add that to the current IDES process unless you are lucky. This is what I was told and not sure if it is correct but it makes since.