Problems with nails can indicate all sorts of problems from vitamin/mineral deficiency to thyroid problems. Not wearing rubber gloves when washing up or using chemicals when cleaning can be a cause as well. I do not recommend self - medication, as taking too large a dose of some vitamins can be toxic as well. I would suggest you have a good medical check - up to make sure you don't have any underlying problems or even fungal infections in your nails and take it from there. I keep very short nails because of thyroid problems causing them to be fragile, so I know how frustrating it is for a crafter.All the best with finding a solution.