[Medical Exam by VA doctor]

Hello everyone, my name is Mike and I have a exam by a VA Doctor next Tues Jan 12th 2016  . Upon entering the Air Force I had flat feet during my entry physical exam my blood pressure was 100/69 and exit physical exam my blood pressure was 134/91. There was no follow up visits for check ups on my blood pressure and while in there I was hospitalizes for two days with diarrhea and real bad stomach pains. I filed a claim for my feet and stomach pains because over the years both systems have gotten worst. I have also developed CHF as a secondary claim in which i have to prove that everything is service connected. Can anyone tell me what to expect from this exam in trying to to service connection disability.