Hi NoseTwitch!
Regarding your concern whether there is a connection between your lower disc degeneration and the nose twitch, I think it is highly unlikely. For most people, it is often normal for them to have occasional twitches called "myokymias". Though if troublesome or persistent, a neurologic consult maybe warranted. These twitches may be related to stress (as I experience this myself on very tired days).
Hope this helps. Regards..