The emergency would be over by now, but I would have just gone to bed. The issues with low BP are when you are standing [and have a fall] or activity. Maybe lay back in the bath in cold water and fasting which reduces the blood flow to the skin and stomach which makes it available where needed.
My interest is that I also had low BP last night. I was mowing the lawn in the heat when I was overcome. I stopped on both sets of stairs on the way to the bathroom where I got in the plunge and ran cold water. By the time I got to test my BP it was 85/55. This is not the first time and it worries me.
