During his last weeks, at Saint-Rémy, his thoughts returned to "memories of the North", and several of the approximately 70 oils, painted during as many days in Auvers-sur-Oise, are reminiscent of northern scenes. In June 1890, he painted several portraits of his doctor, including Portrait of Dr Gachet, and his only etching. In each the emphasis is on Gachet's melancholic disposition. There are other paintings which are probably unfinished, including Thatched Cottages by a Hill.
During the last six or seven months of the year 1889, he has also created at least fifteen paintings of olive trees, a subject which he considered as demanding and compelling. Among these works are Olive Trees with the Alpilles in the Background (1889), about which in a letter to his brother Van Gogh wrote, "At last I have a landscape with olives".While in Saint-Rémy, Van Gogh spent time outside the asylum, where he painted trees in the olive groves. In these works natural life is rendered as gnarled and arthritic as if a personification of the natural world, which are, according to Hughes, filled with "a continuous field of energy of which nature is a manifestation".
By March 1882, Mauve appears to have gone cold towards Van Gogh, and stopped replying to his letters. He had learned of Van Gogh's new domestic arrangement with an alcoholic prostitute, Clasina Maria "Sien" Hoornik (1850–1904), and her young daughter. Van Gogh had met Sien towards the end of January 1882, when she had a five-year-old daughter and was pregnant. She had previously borne two children who died, but Van Gogh was unaware of this; on 2 July, she gave birth to a baby boy, Willem. When Van Gogh's father discovered the details of their relationship, he put pressure on his son to abandon Sien and her two children. Vincent at first defied him, and considered moving the family out of the city, but in late 1883, he left Sien and the children.
In April 2013, Van Dyke revealed that for seven years he had been experiencing symptoms of a neurological disorder, in which he felt a pounding in his head whenever he lay down; but despite his undergoing tests, no diagnosis had been made. He had to cancel scheduled appearances due to fatigue from lack of sleep because of the medical condition. In May 2013, he tweeted that it seemed his titanium dental implants may be responsible.