Contact your clinician and get another mask. Your quality of life, possibly even your life, depends on it. In some countries, insurance coverage may be an issue. Talk to your clinician or insurance provider to learn about your options. Ask your clinician to double-check the mask size and fit.
Most masks come in several sizes.
The first one you try may not be the best one. Ask your clinician if you can try a different style of mask. Most manufacturers produce several mask styles. While one may not work for you, another may be perfect. Find out about different mask configurations.