Xanax doesnt seem to be working

The other day me and my girlfriend bought 8 xans, at first we took halves and nothing, then we took 1.5 and nothing, then we waited a few days and bought some Blues (fetty) then we did 2 xans and a quarter of the blue, i blacked out this time and so did she, we dont remember anything up until the next morning, Is this a normal reaction or am i getting boof? They were farmapram pills from a dealer everyone in the neighborhood trusts and has copped from before