It stops when you take enough deca, lol. It should stop a little after you stop the winny. The winny is just dehydrating your joints, it's not permanent.
For the hair, if you are losing hair from the winny, you will just lose hair on the winny. That won't grow back as far as I know. If this bothers you, you might want to look into another type of AAS. Possibly oxandrolone or primo.