What Causes Sore Throat Along With Metallic Taste In Mouth?

for about 6 months I ve had varying degrees of a sore throat and bring up saliva or bile and must spit a lot. I ve been tested for allergens and none were found and have had my nose xrayed which showed nothing irregular. I ve looked into symptoms of LPR which seems to be consistent with my complaints. To that effect I ve tried Gaviscon, Zantac, Prevacid and Nexium to no avail. I had radiation for a breast tumor 6 months ago. I don t think it s related to my current symptoms but my neck looks a little red. Am also suffering from fatigue and muscle aches which may be because I m sick and tired of this ailment. There is also a chronic metallic taste in my mouth..... any ideas?