You can imagine that often we see patient who come and already after searching in Internet have right in their guess of the diagnosis or treatment. I usually listen well to patients because they know their body better and everyone has their sixth sense. Of course, often it is exaggerated but them after listening, examination we have another chat and usually have nice plan either for investigation or treatment. But you are right often many small things can be fixed by ourselves. Of course, "sick note" is something that we need and nobody else can issue it, I believe many doctors know about that too.