First of all, it is maybe that your glasses are too heavy for you. There are two reasons: one is that your prescription is very very high so that the glass lenses are accordingly very thick making their weight too heavy, the other reason is that the materials of the frame of your glasses is makde of heavy metal. If you are greatly nearsighted, then you can change your heavy glass lenses for a pair of high index glasses whose glass lenses are much thinner and lighter than ordinary lenses, usually one quarter time thinner and lighter. If it is because the material that makes up the glass frame is too heavy, then you can choose light-material frame such as a plastic one. Secondly, your hurting nose also can be caused by inappropriate nose pads of your glasses; maybe they are not set symmetrically or maybe they are set too close. You can go to the glasses shop to have them examined by the professionals and then adjust them to the right position. In addition, wearing the glasses for too long a time can as well cause discomfort on the nose except in the eyes, because the nose have to bear part of the weight of your glasses without rest. Therefore, you should pay attention not to wear your glasses all day long without rest.