An irritated nerve can remain silent for days, and then triggers unexpectedly one day.
Skin zones may become itchy.
Other times it feels just weird: people describe water running under the skin, or string pulling, or moving ants. It doesn’t mean that the nerve is dying, it is your brain deciding that increased sensitivity is needed.
A damaged or irritated nerve will often be associated with previous symptoms. But if you can manage what triggers the pain - mechanical forces, fear, anxiety, etc -, the nerve stop sending danger messages, and pain can stop. The nerves will likely still look damaged on a MRI, but no pain is experienced.
Nerve pain can make you feel like you are crazy, but you are not. This is just a weird way of our body to make us aware of a problem that needs to be addressed.