I hit my big toe into a solid object a few days ago. it has now blown up and is very sore. could it be broken and if so what's the treatment?

Yes, it could.: Yes your big toe could be broken, & x-rays are the way to know for sure, but the treatment is basically the same, for a fracture or sprain of the ligaments & capsule; Rx: immobilization of the bones and joints. A rigid soled shoe, like a wooden clog may be helpful, splinting the big toe with silk tape or other materials to keep the two joints in big toe from moving for a few weeks, soreness <.