What can you do if you have sleep apnea?

CPAP. First line treatment of apnea is cpap. Weight loss is important. A mouth guard may help and there are surgical options.
Depends. Lot of different options what is the cause of it cpap, oral appliance, surgery etc.
See a specialist. Depending on the underlying cause of your obstruction, there are a number of treatment options, which range from weight loss to corrective jaw surgery. A consultation with a specialist in sleep disorders can help determine which option will be right for you.