Consider getting a sleep study which is called a PSG from a sleep lab with a sleep physician. If you have sleep apnea they may recommend a CPAP or refer you to a dentist trained in TMJ and sleep dental medicine to make an oral appliance to help you breath. There are numerous reasons that you may have this problem. It could be due to a deep bite and narrow dental arches. This forces your tongue posteriorly which blocks the airway. Another could be tonsilar blockage or possible enlarged turbinates which keep you from breathing through your nose. Find someone to guide you from sleep studies to airway evaluation. Good luck, its very important for your health.
if you have had this issue and have been told you had an overbite then you might want to look into jaw advancement surgery. This would improve profile, bite, and more importantly your airway. Start by getting a sleep study first then contact a surgeon.
Sleep apnea and proper diagnosis
Sleep apnea is very under diagnosed. It is difficult to get an assessment based on symptoms alone - usually the bed partner can identify the problem or witness the apneic events. I would see a sleep medicine specialist and ask for a polysomnogram (sleep study). This will give the most objective breathing, oxygen, and neurological information during your sleep. It will also be able to tell if you have an obstructive or another cause to the events. From the photo alone it doesn't appear you have a clear dentofacial cause, but it is a limited photo - a proper CT scan or cephalogram would help your diagnosis as well from a surgical planning perspective. Good luck.
Severe Sleep Apnea undiagnosed
Did any of your physicians ever have you take a PSG (in-lab sleep test) or an HST (home sleep test)? That is the only way to diagnose sleep apnea.
Severe sleep apnea and no diagnosis
If you have severe obstructive sleep apnea, then there are many treatments available to you. I would see a board certified sleep medicine specialist and get on CPAP. If CPAP doesn't work, then see a fellowship trained sleep surgeon who can diagnose and treat the level of obstruction that you're experiencing during sleep.
you need to see an ENT that does sleep apnea testing and usually hooks you up to a machine for a night and analyzes your heart rates and breathing for the entire night . Then they can evaluate you better and rule out sleep apnea or give you an oral device tahat will help you breath better at night.
You are in a difficult situation as it is not a normal history and symptoms that is affecting you. I would continue to look for either a sleep physician or ENT that can help you get properly assessed and diagnosed. You may even benefit from seeing a dentist that does sleep appliances and uses a pharyngometer that is technology that uses sounds waves to map out your airway.
It may be anatomical, it may be muscle spasms or it could be something else. Even acupuncture would be an avenue to pursue.
I wish that I could be more helpful--don't give up.