I don't think elevated Hematocrit will cause ED; but there are a bunch of other things that will cause it.
If you tried everything, and I mean everything, and all labs present no indication for why you have ED than I'd suggest you look into Trimix
Trust me, it provides an excellent erection to 98% of men where PDE5i's failed.
I tried it numerous times, more for recreation than anything else, and let me tell you; if you want sex like a porn star and want that lasting effect nothing, and I mean nothing, will beat out Trimix...trust me.
Yes, you need to conduct a very small injection into the side of your penis with an insulin pin. You will usually use a pen so you don't see it happen and its ultra fast.
And contrary to everyone's belief, it doesn't hurt one bit. There are few never endings on the shaft of the penis so you will think when you push the button on the pen to release and inject that it even happened.
But you'll know it did in about 5 minutes
I am assuming your libido is good?