Have you not discussed these results with your cardiologist? It's impossible to say "how bad off you are", but based on some of the information you provided, the layman's interpretation is that you have a very thick heart muscle that doesn't relax well enough between beats to allow very much blood to collect in the ventricle. The ventricle is probably reduced in size. This also impedes how much blood is pumped out with every beat. Essentially, you a have a "stiff" heart that pumps very strongly (based on 75% ejection fraction), but because of reduced cavity size (and obstruction), the volume of blood it pumps to the body isn't enough.
I assume you're taking some type of medication to help "relax" the heart muscle? Has your doctor discussed surgery that would remove the obstruction or reduce muscle thickness? I think it uses alchohol ablation technique, but your doctor would know more about this.