Keep heart. My numbness lasted for ~7 months and then suddenly it went away.
Your worry is understandable, but try to give it even more time (even though 3 months feels like a long time already).
It’s hard to say exactly when it started happening, but the morning wood came back a few months before the libido or sensation or being able to get an erection out of arousal.
Advice (aside from mere patience) is hard to give because of how ambiguous this condition still is. but I’m of the opinion that blood flow to the area helps with healing. So maybe try to warm your genital area up daily or massage, etc.
I wonder if maybe the hormonal receptors in our brain get blocked/switched off for much longer than doctors think happens. So our body naturally clears away the blockages but it takes time. And then once those final blockages start to dissapear, things start to seem normal again.
Admittedly throwing shit against a wall. But that’s what we’re stuck with. Look on the bright side: at least a bunch of pharma executuves at Merck are getting filthy rich /s.