Thanks for the query to H.C.M. Forum.
Since , how many days you are having these symptoms .
Nodule are there and you feeling difficulty in swallowing , this is very serious .
Nodule may turn into toxic forms or may turn into malignant tumor
In my opinion consult an Endocrinologist/ SURGEON at once and get his opinion.
Alternatively , you can upload all reports over this site.
Surgery is one option.