I feel much better after using my CPAP for a few weeks. Can I stop using my CPAP now that I am better?

SDB is usually a lifelong challenge. Feeling better with PAP therapy is a good thing as you are treating your SDB with the required therapy. Stopping therapy will likely cause symptoms to return, including increased fatigue and the inability to sleep. Some people overcome their SDB though diet, surgery or dental appliances, but most will require PAP therapy for an indefinite duration.