Could be this:
http://thewellnessdigest.com/subclav...d-finger-pain/

Found this for subclavius massage (usual caveats apply, be careful, dont do anything that worsens your symptoms or pain). With swelling especially, there might be blood vessels involved which means be extra extra careful or ask a Dr or Pt for their opinion before trying anything yourself.
https://www.youtube.com/watch?v=sHtaFaOPlTk