I had similar symtoms early in what I was later disagnosed as sub acute thyroiditis. I am told this is fairly rare, but more common thyroid issues have similar symtoms. Do you have any other issues; like unexplained aches and pains, change in BP, fatigue/tired, raised/lowered body temp, weight lose or gain. I went to an ENT first also and he ruled out any sinus or trachea issues. An ENT does limited work with the thyroid (I.e. surgery, nodules). Also does it hurt to touch your neck? If the ENT rules out any non-thyroid problems, make sure he/she orders thyroid function tests (TSH, FT4, T3). Hope it works out. Subacute thyroiditis and thyroid issues in general stink!
I have experienced the same. I was told my thyroid was normal, but I also know they did not run all the tests.