Hi and yes, all the time. It feels like an empty hole that needs filling, or a hunger/thirst that needs satisfying. It's kinda like the feeling where you think you're forgetting something important.
I usually cope with the "craving" feeling in a bad way, by self-medicating either with meds, or recreational drugs. I cannot handle the feeling and it won't pass so I must quell it down with something. I know it's wrong but I can't stop until I learn a better way.
Good luck, take care and keep us posted.