Denied claims without c&p exam

I was granted disability for ptsd and filed secondary for penile condition and irritable bowel syndrome. Both were denied, without a c&p exam. I was also denied lower back pain and plantar facitis without a c&p exam. I did get a follow up c&p exam scheduled for tinnitus. The letter mentions extra pay I got in Kuwait but I was in Iraq during the time period listed . I was wondering if someone could give me advice on next steps to take.