Great while on it but the next day ...

I did phenibut quite a bit about two years ago fairly regularly and enjoyed it no probs and now is the first time since then. So I did it again last night (1.5gms which was a light dose back then) and had a great time and it felt great but this morning I woke and and was lost and confused. I woke up and couldn't remember much. I've been reading web articles and watching news all day and had to go back and reread and rewatch everything both and my memory is shot and I can't recall 5mins ago. I'm even having a hard time even typing this now in the evening without going back and retyping it. I know my mind isn't shot since back then. Anybody else experience this? I hope I'm better next week and will lay off it again for a bit if it's not. I've had to reread this too many times to check it properly. Having said that the afterglow today was great. I was out today and the sun was shining and my music earbuds sounded great. Lol even now I know I'm rambling.