I would guess that the reason your doctor said this is because much of the research suggest that the majority of cases will recover within 3 months, which is probably true. He may have misunderstood this to mean that all cases will recover within 3 months?

Or maybe he just thinks that he understands the brain better than he (or anyone else) actually does.

Rest assured that the research evidence and the experiences of many of us on this board show clearly that recovery can continue well beyond three months. I'm tempted to say don't bother seeing this doctor again, however if he is thinking about helping you with ways of coping, or of referring you to someone else who will, then this potentially could be quite useful for you even his decision is based on faulty medical knowledge.

Good luck!