Don't get me wrong, you are totally within your right to be concerned about his response. I was just trying to help you understand what I felt was a possible/probable scenario. Unknown medical situation would drive me nuts too. I have a S12 who, although we have a ballpark idea of what is wrong, we don't have a conclusive diagnosis. It makes it hard to deal with something, without a full diagnosis. In fact, they change the treatment on a bi-month to bi-month basis.
It's hard to deal with doctors and medications when you really don't see any real improvement or conclusions. In some ways I see it as a real "shell game", just another way to bill someone for a paycheck. I'm sure that's how you feel right now.