Can you describe how you descend at the moment?
With hyper-vigilance, I guess?
If I can see that there's a point at which I will stop accelerating, and it's clear (so, for instance, a road that descends steeply but also climbs steeply within view), then I'm fine. I know when it's going to stop. I have issues where I don't know when I'm going to stop accelerating, and if there's going to be something in the road just out of sight, or I will end up with a speed wobble, or the brakes won't slow me down or stop me, or I hit something I didn't know was in the road.
I also feel very unstable on a bike at a steep angle, like I'm going to fall off over the handlebars, or the back end is going to come over my head (I am aware this is largely irrational). Mostly it's just the not feeling able to control my ability to stop just beyond the distance I can see to be clear.
I consciously relax my grip, but I tend to feather the brakes frequently when I start getting that out of control feeling. That's fine on short descents, but on long ones it could cause problems with the brakes overheating, maybe? And if I brake less often, they have more to do?
On the flat, if I stop pedalling, I slow down. I am in control of that speed, and it's more stable when you're pedalling anyway. On a descent, the only thing I've got is the brakes (or diving into a hedge, which is not recommended as a braking strategy).
Following someone I trust would be great, but I can't magic someone up. I gave up on cycling clubs when I was refused entry to two of them because of having only one eye. I don't ride solo all the time by choice.
Sam