Yes, I can relate to this too.It is horrible and you need to experience it to believe it. For me, it feels as though my major organs are just failing as there seems to be a complete energy failure. The worst is the effect on the heart as it feels as though it hasn't the energy to keep beating. As it worsens, the heart rate drops to about 30 a minute, and it feels as though it is really struggling. Horrible! I find that the best position is to lie on my right side, almost onto my front as it seems as though it isn't such a strain on the heart.
I'm sorry that you are struggling with this too.