The Doctor

In both Michael Cunnigham's The Hours (and the movie adaption directed by Stephen Daldry) and Virginia Woolf's Mrs. Dalloway, the disconnect between what the various doctors think will help and how Septimus and Woolf respond to that plays a very important role. In both cases this disconnect makes the doctors ineffectual and ultimately helps contribute to the suicide of their patients through their inadequacies. 

 In The Hours the doctor is the one that prescribes Woolf's isolation and 'rest cure' in the country (which is supposed to give her mind time to recover away from the city, and all of the sensory stimulations that the doctors believe led to her mental issues). However, Woolf hates the country and her condition only grows worse as they spend more time there, ultimately ending in her suicide, despite the fact that Woolf did enjoy living.

Similarly, in Mrs. Dalloway one doctor believes that Septimus is simply not masculine enough to deal with his scarring from being in the war and prescribed bromide, which doesn't do anything to help him, and the second, Sir William Bradshaw prescribes the 'rest cure', which doesn't even get put in effect in this case.  The inadequacy of the doctor also leads to the suicide of Septimus even though he, like Woolf did not actually want to die. 

Given that The Hours is written at lest partially about Woolf while she was writing Mrs. Dalloway, it doesn't take much of a stretch of the imagination to say that Woolf was drawing on her own experiences with the inadequacies of the treatment of mental health issues to argue that they need to be improved through Septimus.