The severe somatic symptoms you are describing such as a subjective feeling of suffocation despite normal oxygen levels, an overwhelming nighttime "void," extreme thirst, and dry mouth—strongly point toward severe Generalized Anxiety Disorder (GAD) with nocturnal panic attacks.
When your body enters a hyperarousal state, the fight-or-flight response dries up saliva production and causes rapid, shallow breathing (hyperventilation), which clinically creates the sensation of air hunger or suffocation. Additionally, your experiences in crowded places (feeling numb, a frozen brain, and a weird ringing or sensation in your ears) indicate sensory overload and mild dissociation (zoning out), which your mind uses to protect itself when anxiety levels spike too high.
Next Steps
Consult a Psychiatrist: You need a formal evaluation. A psychiatrist can prescribe short-term, safe anxiolytics or SSRIs to lower your baseline autonomic hyperarousal, which will directly reduce the dry mouth, nighttime suffocation, and panic. You can book a session with me.
Establish a Grounding Routine for Sensory Overload: When you feel your brain "freeze" or zone out in noisy, crowded places, use physical grounding. Carry a bottle of cold water to sip, or focus heavily on naming three physical objects you can touch around you to anchor your nervous system.
Fix Your Eating and Sleep Schedule: A 14 to 17-hour gap between dinner and brunch can trigger low blood
sugar (hypoglycemia), which releases adrenaline and directly mimics or worsens panic attacks. Keep a light snack, like almonds or biscuits, by your bed to eat if you are awake late, and do not skip breakfast.
Health Tips
Avoid over-consuming water when you experience nighttime thirst. The dry mouth is caused by adrenaline blocking your salivary glands, not actual dehydration; drinking massive amounts of water rapidly can disrupt your electrolyte balance. Instead, just rinse your mouth or take small sips.
Practice Box Breathing in Bed: The moment you lie down and feel suffocation building, do not fight for air. Force yourself to breathe out fully, then inhale through your nose for 4 seconds, hold for 4 seconds, and exhale slowly through pursed lips for 6 seconds to reset your carbon dioxide levels.