Problem below Adam's Apple. For tests.

Hi Doctor, I am facing a strange problem for the first time below Adam's Apple in the neck. Since last 1 month I feel tightness in that area as if someone is pressing my neck. Also sometimes in that area I feel a sharp pinch in that area as if a sharp thing in my neck and sometimes I feel some kind of acid coming out of that part inside the neck which hurts. Also I feel some kind of hoarseness in that area which makes me clear my throat everytime. Also I am unable to speak in high pitch sometimes and unable to do it. Pls suggest what it can be...I just remember gargling with a mouthwash Clohex by mistake 1 month back after which I started getting this problem. Also I am scared with the idea of getting anything inside my neck or mouth for tests. Regards, Ankur