s possible your dealing with a sinus infection, allergy, medication side effect, diet related, acid reflux or GERD etc etc
Keep in mind that if for example you were dealing with something like a nasal allergy, it would be effecting your
sleep quality to the point of
sleep deprivation, which in turn will effect the amount of energy you have during the day and could also account for why you are yawning so much and having trouble staying awake at work, feeling off balance and weak and still be ne