Swallowing with pain and now hoarse

I drank a bit of some drink 4 weeks ago, it went down the wrong tube. I was coughing and trying to clear my throat for hours after. It's been weeks now. I had some nasal
dripping, some coughing, feeling of rawness and hoarseness ever since. There is a minute amount of phlegm which is clear.

Went to an ENT *doctor* a few days ago who had a view with an endoscope - said he couldn't see anything. Regardless of his not being able to see anything I know what I feel and I know my voice is now hoarse. For years I had occasional problems swallowing where all of a sudden something went weird in my throat - spasms - and I had to manually move whatever was hurting back to its place. Never had anything like this before.

Thanks for any assistance with this.