The back left side of my head hurts when i swallow and i've been experiencing some chest pain and strange sinus like headaches over the past 4 days. i'm really anxious whenever i go to the hospital and don't want this to be something bad?

Can see one's doctor: Swallowing pains can be from a strep throat infection (antibiotics are needed), a cold or the flu (antibiotics usually not used), or from some other cause such as allergies, irritants, or acid reflux. Usually, a person sees the doctor if such symptoms are bothersome, recurrent, or don't go away quickly. If one's chest has worrisome or increasing symptoms, the ER may be a better place to get seen.