Hi Leszek,
Nice videos,
The short axis helps a lot to get a perspective.
Now to me it just looks like a normal cervical lymph node.
I would not have worried about it personally.
It seems adjacent to the internal jugular vein rather than within it and you can see a few other adjacent benign looking nodes.
The node is oval shaped and has a normal echogenic hilum.
I would be surprised if this is the source of the pain.
The vagus nerve is right next to it, but appears normal.
Steve.