I can only echo RD's advice. We always tell people to go and get a medical, right after their Trial Lesson, if they express an interest in continuing.
I well remember one young lad, son of an ex-RAF pilot who had an illustrious career with the airlines, who was absolutely distraught to find out that he couldn't get a professional licence, due to a medical problem. However, he hadn't done much flying and being young, got over it.
TOO