Pain in chest and exaustion after speaking

As I could not classify my problem particularly under any topic I am posting it here. I get pain in my chest ( felt mostly on frontal ribs) after I speak for about ten minutes, I get exhausted and also feel pain in my thorat.

I am otherwise healthy, I practice yoga as well and even teach yoga. Primarily I am a Physicist by profession(not physician :) ) and do experimental work most of the times. I also teach, but I have quit teaching after I developed this problem.

I am unable to understand the cause for this, doctors have given me some medicine suspecting laryngitis but it did not help. Could it be thyroid problem ?

I do not smoke or drink. Please help.
 
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