I am Prior service and thinking about re-enlisting. ?

I am Prior service and thinking about re-enlisting. I have been out of the Army more than 10 years and have put my body through many aches and pains and broken bones no surgery though and nothing physically as anatomy wise to stop me. I go to the Veterans Hospital, will the Army go through my V.A. Medical Records to check my medical history? I have Acid Reflux and it is controled by medication. I have to take it every day. If I chage my diet I might be able to get rid of it or slow down but I have not tried yet. I am concerned that if I re-enlist and don't state that I have Acid Reflux and are in Basic Training and it gets worse and need medication again. Will they go throught my V.A. Medical Records? Does any know the severity of the punishment when they find out that I did not state that I have Acid Reflux in the first place. I have my mind set to get back in and I just don't want anything to stop it from happening.