This could be a type of "strain" or injury related to the activity you did.

The nerves and blood flow that run thru the neck/collarbone areas could have gotten pinched /irritated, and now muscle spasms have joined in. Muscles & trigger points can affect the nerves too. A pinch or compression up in the neck can appear as hand/arm pain/sx.

I suggest exploring the sticky threads on our thoracic outlet syndrome forum. Also called TOS for short.

Have you ever had a whiplash type injury, desk or repetitive job, poor upper body posture? These can all play a part in the possible development of TOS.

Can you hold your arms up like "stick em up" opening & closing hands for very long? Do they turn white, get heavy, more pain?
more info here on TOS forum-
http://neurotalk.psychcentral.com/forum24.html