My name is Bob. I from time to time feel tingling over the upper part of my body very similar to pins and needles . This sensation lasts for 15-30 seconds but never longer than maybe 1 minute. It can come at anytime, rest, watching TV, driving, etc. Check up in the ER said it was possibly a low potassium level but it was only about 1 to 2 points low. Any ideas.