Communication frustration

I'm travelling, mostly on foot, with a doctor who is trying to explain the condition and treatment that I've had. He gave a cursory explanation but I asked for more detail because, as I said, it was happening to me so it was important to me. He struggled to put it into terms I could understand and I found it hard to work out which parts of what he was saying were the most important. We were both getting frustrated, him trying to explain and me trying to understand. At one point we encountered another doctor and the two had a conversation, the one I was with was clearly relieved to be able to communicate without difficulty.