Phenibut can help lots of serious issues, but I personally wouldn't take it unless I talked to a doctor first. Currently there is a lack of information in literature about physiological dependence and addiction to the substance, yet I've read plenty of people on forums describing having trouble with it.
This case report by Brunner and Levy (Journal of Addiction Medicine. 11(3):239–240, MAY 2017) shows a case of someone who became addicted and who struggled to get off of it even with formal chemical dependence therapy visits to his house, and eventually needed phenobarbital to get off of it. Although that it may not be that extreme for everyone, it would be better to stay safe, as such physicians are calling for more study to determine if Phenibut should be a controlled substance.