I agree with em. It sounds as if it is your nerves. Your back is probably out of alignment. I have severe back problems and nerve issues and I get hot and cold spots, it was explained to me that it was the nerves way of compensating. I also think that hormonal imbalances affect how our body takes in vitamins etc and you may want to see if taking Complex B vitamins helps. B vitamins help nerves. Best wishes, Sissie
the sciatic nerve perhaps. the htn and palpitations are probably unrelated and symptoms of another issue