Pins and needles during sex! HELP!

Morgan
im searching for answers! 
When i have sex (which is often) i get pins and needles in my jaw, and it feels like my teeth are vibrating, and the other day i got pins and needles in my arms to the point where i couldnt move the muscles in my hands! Has anybody else experienced this? (Fyi: i have a few blood disorders including low blood pressure and i have heard that sex lowers your blood pressure so im not sure whats going on!) 

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