My fiancé had pretty much the SAME thing happen to him! Only he described having back to back climaxes followed by those symptoms you described. Both arms and his face were affected also.
While he was having back to back climaxes, he didn't ejaculate once. Then he stopped me and went real ridged. So I helped him into a hot shower and tried my best to massage his muscles out and give him some relief from the "disfigured frozen state". I wasn't doing anything "special" or out of the ordinary either. Its bazaar and we, too, would also like some resemblance of an answer or explanation. We're young and in good health also, and this has never happened to him before. Freaked me out big time.
Hi,
Stroke symptoms include: sudden numbness or weakness of face, arm or leg - especially on one side of the body; sudden confusion, trouble speaking or understanding; sudden trouble seeing in one or both eyes; sudden trouble walking, dizziness, loss of balance or coordination; or sudden severe headache with no known cause.
I do not think what you have experienced is a form of stroke. Being healthy and fit as you mentioned, this is just a normal reaction of your body to the sensations you are experiencing. If it persists, however, an evaluation by your doctor is warranted.
Take care and regards.