Copper/metal taste, now and again cough

[opusthe2nd]

Past 3 yrs or so I get a slight cough with a metallic taste.  Never could get anyone to figure it out.  It never gets up to my layrnx or effects my voice.  Sometimes I "lump in my throat" at the suprasternal notch.  A non-productive cough that sounds like it should be productive.  Never any sputnum, even if I try.  If I eat more than  I should of, I feel discomfort but probably not more than anyone else would.  Very slight tenderness below my sternum once in a while.  If I try hard enough I can feel a little pain behind sternum very infrequently, mostly if I take a very big breath...just to see if I can feel anything.   A year ago, wife was diagnosed with breast cancer, with no insurance.  About a month after that I tried to have a heart attack but failed. :)  ER treated me for heart then asked me if I had any stressed.  I laughed and explained.  They laughed and said they thought it was a stress related thing.  Kept me for 14 hrs and gave me a spotless bill of health with no signs af any heart issues.
I weaned myself off Enbrel a couple years ago, didnt like the minor, weird side effects.  Started on Reumofan, hadnt felt better EVER!  FDA pulled it because they say the found Dexamethasone in it.  I guess that would explain why I felt so good.  Never had the cough or metal taste during the time I used Reumofan.  I am not back on Enbrel, and not happy about it.  I take say 15mg, 1x weekly...or something like that.  Just enough to take the edge off.  Reumotolgist approved this dosage.
About a month off Reumofan, Dr wanted to check my blood just to see if there were any steroid use indicated.  I gained 15# and I never gain weight.  Blood tests came back negative for anything.  I dont remember the complete workup but I had everything I could think of checked.  Dr called me a "speciman of health".

[David Tinkelman, M.D.]

There are many, many causes of chronic cough and even a very systematic approach may not reveal the cause.  A metallic taste may be secondary to medication but in many instances the cause is never found.  Fortunately having a metallic taste is seldom an indicator of serious disease.

The following is the Mayo Clinic statement on metallic tastes:

Metallic taste in mouth: A cause for concern?

A metallic taste in the mouth is a fairly common problem — and usually not serious. Although you don't have actual taste buds that detect metals, the perception of the taste is described as "metallic."
A metallic taste can be due to many factors. But the most common causes of a metallic taste are:
• Medications such as some antibiotics, prenatal vitamins and antidepressants, as well as drugs used to treat high blood pressure, rheumatoid arthritis and kidney stones
• Oral problems, including oral infections such as gingivitis or periodontitis, tooth infections, and poor oral hygiene
Sometimes the cause of a metallic taste can't be determined. In many cases, the problem goes away on its own after several months or longer. Proper oral hygiene can help, including regularly brushing your teeth and brushing and scraping your tongue. Done properly, dental restorations — such as fillings and inlays — are rarely the cause a metallic taste.

[opusthe2nd]

[added]
Psoriatic arthritis for 30+ yrs, Mild psoriasis, Enbrel for 5+ yrs- light dose, Son had a fundoplication at 2 mo old, Head of bed raised a couple inches. Mom and Grandmother always fiddling with their stomachs.  Tea or hot water to settle it was about all needed, Mom is on Pervacid 2x daily. I am a singer, 5' 10" - 182#, Blood type O, Diet is a lot of fiber and I eat very healthy and well.
Nothing in excess, no alcohol, drugs, smoke.  
I am a coffee roaster but I limit myself to 1 cup a day.  If I dont drink coffee, it doesnt change.
Lungs excellent.  Blew a 650 on the...well, whatever its called.
O2 sat is perfect, BP perfect.