Oh, that's a familiar situation When the morning starts with a “toilet quest,” the day is clearly not going to be easy. If you've already checked everything and the water is still standing, then most likely the problem is not in the tank, but in the riser or pipe itself. There may be a blockage further down the system that cannot be cleared without special tools. If you can't find a plumber right away, you can take a look here
drain cleaning toronto. Although the site is Canadian, it has a great description of how professional drain cleaning works and what to ask the plumber before they start work. Read it — it will help you navigate so you don't run into a “pseudo-professional.” In the meantime, you can try the old trick with baking soda and vinegar, which sometimes saves the day before the plumber arrives.