medications as prescribed, somedays it's like I'm drunk?

I did not put my name because I am kind of embarrassed. I was wondering if anyone can help me understand why this happens. I take my medications as I am prescribed but then somedays out of the blue it is like I am drunk but I do not drink and then I forget the things I did in that state, like I am drunk. I do not understand it and do not know how to explain it to my husband. My doctor has talked to me in this state and he thought I was drinking and tested my blood for overdosing my medications and drinking or taking illegal drugs. I did none of the above.