I m experiencing a heaviness in the back of my head and neck, squeezing in my throat resulting in choking, but rarely. Anxiety and squeezing in chest. Gasping for air at night, light headedness with vertigo. Worse after dental appt He used a shot with epinephrine in it and I had a panick attack in office with difficulty breathing. My brain feels swollen too. No period for two months age 54 new hot flashes. I have cervical vertebrae that are fused together.