Feeling of large lump in throat with post nasal drip and acid reflux. what could cause the back of neck to hurt when breathing in with these things?

Doctor can examine: Throat symptoms can be from a strep throat infection (antibiotics needed), a cold or influenza (antibiotics usually not used), or from some other cause such as allergies, irritants, stomach reflux, etc... Usually, a person sees her doctor if the throat symptoms are bothersome, recurrent, or don't go away quickly. An adult with a "lump" sensation should have an in-person exam and follow-up.