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yeh I had aerobars and used them a lot in this last race – they definitely helped general comfort and provided relief in my hands but unfortunately didn't mitigate the problem. I also had them on my MTB earlier in the year for an offroad race but barely used them as the terrain just didn't suit them
cg-
I'm no expert and you should probably talk with a professional. But, ulnar nerve flossing could help, you could google some exercises. I suppose it might also be your neck instead of you hands that's causing the problems, nerves pinching somewhere further. And with aerobars I feel it's important to have extensions that put you wrists in a neutral position, which many of the straighter extensions don't really do, I'd say it's better to have a proper bend in them. And on the MTB I like the inner barends for a slightly different position that's still good enough for some of the terrain and keeps your fingers on the brake levers.
Samuli
Do you have aerobars? Are you using them? They're probably the single biggest change you can make to take pressure off your hands.