Numbness in right foot accompanied by twitching in right hand.

I am a 66 yr old male. For a few years now, I have experienced, generally for around 60 seconds, once each day, spells where my right foot goes numb (can't move toes or pivot foot at the ankle) accompanied by twitching/spasms in my right hand. At first it was triggered by certain physical movement, now I can get it during any kind of physical activity or even just while I am sitting in a chair. Stressful conversations or situations can also trigger the spells. These brief spells haven't caused me to fall or lose control of any activity. X-rays of the hip and neck haven't revealed any bone spurs or pinched nerves and an EMG didn't reveal anything abnormal. Any ideas? Might taking a once per day vitamin supplement for men over 50 or drinking a sugar free energy drink containing high amounts of B vitamins contribute to this? Have tried abstaining from both of these with no major differences noted. Any ideas?