Like Cheryl said, you need to see an ENT, preferably one that's familiar with OC. The cost should be less than an ounce of herb
What are they looking to biopsy? Do you have an area, lesion or node that's suspicious?
I'm not a doctor but I've heard of these symptoms many times and it quite possibly could be an acid reflux/globus issue. The constant pain/burning and feeling of something stuck. Now, mouth ulcers etc. I still stand by my gut in saying if this was sinister, you'd be a very sick man by now or even not with us. In several years, if indeed this was OC, it would have spread to your nodes or have been obvious to ER docs or a dentist.
Good luck. I pray it isn't anything serious. We're all here for support if it is.
Positive thoughts and prayers
"T"