Hi @annierae and I also welcome you. I just read your current situation, and the not being able to sleep lying down and the shortness of breath plus the feeling of water weight reminded me so much of what started my heart issues. I was having the same issue not being able to sleep lying down when I finally went to a hospital. Well, when they saw me and realized how bad I looked I was rushed into the trama section and the diagnosis was lots of water had built up around my heart and lungs which caused the shortness of breath. Well basically I was put on iv diuretics and after a couple of days of peeing, I was transferred to a cardiac hospital and was treated for an enlarged heart. It was explained that my heart was weakened by all the fluid and caused my heart to enlarge fighting against the fluid. Luckily my PCP at the time realized what was going on and called in a cardiologist that diagnosed the problem. Mine my ef dropped to 5 % and I ended up with meds and a pacemaker. At least with you it looks like your EF at 70 % your heart sounds like it's in better shape but like everyone else I would get another opinion.
Have a Blessed Day
Dana