Getting scoped from GI doctor or ph test are not going to tell you anything about your swallowing. You need you get a high def manometry. This will tell you what your upper and lower esphogus sphincter pressure is as well as your swallowing motility. Obviously,if your refluxing into your throat (lpr reflux) then that would cause swallowing issues. Tightness in the throat, phlem can be a vagus nerve distinction. Amitriptyline, lyrica, gabapentin are drugs of choice to treat that.

Google you should also see an ent to examine your vocal folds. It's important to see if they are working properly.

I'm on myipad right now but I can give you more information about all this if you need. This is how my PN started.