Does carpel tunnel come and go? One day pain being 10 and the next being 0.

Possible. Carpal tunnel synd (cts) can get better and worse depending on a number of issues. The initial treatment is easy, get a "cock up" wrist splint and wear it to bed every night. It prevents you from "dropping"your wrists while you sleep which puts pressure on the median nerve as it passes through the canal.
Possible. Yes. Any condition, exercise, activity that wil increase swelling in the carpal tunnel may lead to a, increase in symptoms, thismismwhynelevation of the hands and splinting at night may help ease the pain whereas dependency and activity during the day may increase the discomfort.