noticed white layer on my tongue

Recently i noticed white layer on my tongue , but when i use mouth wash it disappear .Im using mouth wash from last 2 months,
Few days befor i decided to stop using that , and when i stop that white layer start again.

I have tested myself with TRI-DOT and Elisa both are NON-REACTIVE.

But my physician told me that TRIO-DOT is ordinary test , we cant trust that result . is it true ?
But i heard it is similar to forth generation ELISA.

I had protected sex with prostitute dont know exactly but almost 4-5 years back . may be condom broke

Dont understand what to do?

Two negative result still these symtoms. NOw im scared to retest again?


please help