Having open nasal passageways is important if you want to eventually benefit from sleep apnea treatment options, especially with
CPAP. Once your nose is open, give
CPAP another try. There are many ways of gradually adjusting to using CPAP.
Another option is to use a formal mandibular advancement device that's made by dentists (not the boil and bite over the counter anti-snoring models), but you have to have the right anatomy and severe sleep apnea patients don't respond as well.