Posted: 15/02/2015 at 16:23
Olive trees really need to be outside or in a cool conservatory. A north-facing room will have low light levels, especially in the winter. They need high light levels even in the winter, and in cool condtions they need roots to be kept dry. Don't water it any more until the soil completely at least an inch below the surface. Do you have a greenhouse or similar that it could be moved to? It would shock it too much to move it outside now.