Diagnosed With Acid Reflux Along With Nausea, Unable To Swallow, Mucus In Throat. Causes ?

I was recently diagnosed with acid reflux which is often accompanied with nausea which I suffer with most days f the week, I have been having problem with my throat, sometimes I Find it hard to swallow and I get a lot of mucus in the back of my throat, I have the mucus every day and was given a buconase nasal spray but is no helping, my throat has a tightness to it at the middle part of the neck as if someone has there hand around my kneck, what could be causing these issues? Thanks