i am 50 years old with no history of heartburn / acid problems - for the past 2 weeks i have had a burning type sensation in the back of my throat that comes and goes but becoming more frequent and lasting longer - it has no pattern and can happen whether i have eaten or my stomach is empty - it does not hurt and its not sore - no feeling of lump in throat - only other thing is now again is my food can taste funny - any idea, thank you