3 days breathing uncomfortable when standing, mucus build up, sinus pressure, feeling of fullness in throat or chest like nausea, white mucus dizzines

Sinus: Maybe the onset of a cold if you have a fever or allergies try an antihistamine if there's no fever and see it if makes a difference if not then OTC cold medication

Typical cold symptom: Your symptoms are compatible with typical cold virus, may have sore throat, runny nose, nasal & sinus congestion, may have fever for several days, mucous may be green/yellow & may last 10-14 days. If no contraindications, antihistamines with short acting decongestants work best, also Umcka coldcare series helpful and otc Ibuprofen or Naproxen or Tylenol (acetaminophen) for fever or pain. See MD if gets worse