Oh yeah buddy big time. Worse the more you take and even worse if you are going for days or weeks straight. Careful with that stuff, I've been stepping down off line 2g a day because I'm a moron and didn't read up on the addictivity of it. In down to less than 500 now and I did it slow (months) so it didn't bother me. I think the stuff is crazy useful but it's not trivial and it's not a real nootropic either, it's got some effects on calcium channel uptake on nerve axons like Lyrica does. That MOA appears to have a rebound on it, and phenibut effects Gaba, which is how alcohol and benzos work to. It's better than that because you don't get impulsive dosing or real cravings for the high but it can and will kick your butt if not careful.
Like I said it's crazy useful if you've got something going on line occasional anxiety or panic attacks, just keep it to a day or two at a time - around the dose you got, not more than a gram in 24 Ave it should be minimal. Take several days off, stuff lasts in the system a while.