Yeah, thats what Inversion therapy is .... So that your head is lower than your heart. Yoga has a whole bunch of poses, which encourage inversion.
I love inversion and use my Ottoman and sofa cushions to invert my upper torso. Really helps in clearing sinuses & mind.
I cannot follow the avoidance rule, as its beautiful weather and like to go outside. Drugs dont work on me. In fact nothing has worked so far.
For me it was interesting to read that even allergies and asthama could be caused by pinched nerves. I will find out in a month....