Low B12 levels affect the nerves. Some of these are autonomic ones and can give the symptoms you report.
I'd get that tested and make sure you are over 400 level, in US units. The lab ranges in US have not been changed to reflect new information and lows below 400 can cause neurological damage in some patients.
If you are low, then supplementing with B12 is important. Here is my B12 informational thread:
http://neurotalk.psychcentral.com/thread85103.html
While you are getting that looked at, have a Vit D level done at the same time. Low vitamin D impacts calcium and when calcium gets low there are paresthesias which come and go in the skin and face. Low D is very common today.
As with B12, testing is done by doctors. But treatment is often still not efficient. RX D is D2 and not very active in humans. It is puzzling why doctors still even prescribe it!
OTC D3 is better by far, so if you are low, supplement with the OTC D3 to get good results.
Here is a Vit D thread with medical videos:
http://neurotalk.psychcentral.com/thread92116.html
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All truths are easy to understand once they are discovered; the point is to discover them.-- Galileo Galilei
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Weezie looking at petunias 8.25.2017
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