Hi Dlou,
To put your mind completely at rest you need to make an appt to see your GP.
I have and have had for years throat problems,(sometimes due to anxiety, sometimes due to my heavy smoking :-( !!) had surgery 5 years ago on throat to remove polyps and nodules, the wait for the results after surgery where hell but thankfully turned out to be simple polyps and nodules.
The annoying thing with nodules is people say its singers and people who shout alot mainly get them i dont do either so therefore it has been put down to my anxiety.
Hope all works out and try and be kind to yourself as neptuno said bloods and swabs would show if there was anything untoward going on.
Brightest Angel Blessings
Mystics