When did Mrs. Weston go to see her doctor?

When John Weston awoke that morning, he remembered that his mother was going into hospital. He hadn’t worked out quite what was wrong with her. He knew, though, that she hadn’t been well for some time now, and it had become almost familiar to him to see her eyes narrowed in a sudden attack of pain, and her hand pressing against her heart. Their own doctor, who he has had finally gone to for advice, had sent her to a specialist who knew all about these things. He had told her that just as soon as there was a bed for her, she would have to come into his hospital, where he could look after her himself.
    During the weeks since then the pains had come even more frequently, and the narrowed eyes became an almost permanent part of her expression. Always rather sharp, she began losing her temper over little things so that John’s father kept his thoughts to himself more and more. John, as ready as possible to make allowance, tried to think what it would be like to have toothache all the time and how bad tempered that you would be.