Imagine if you smoked everyday and then stopped. You'd probably be dreaming about smoking. Your body is craving whatever you used to have or is a little confused.
I wouldn't really worry about it. You can either start masturbating again, but at lesser intervals like once a month, or you can start spending more time working out, meeting women, or something else.
Your body/mind is just used to something, and now it's just coping with the lack of it.