Alcohol and Memantine

Hi yall,
I started 5mg memantine a month ago for hair pulling. I just increased to 10mg a few days ago. Im kind of a heavy drinker the last 4 months. When I drink I feel way more tired and lethargic, and cant tell if its truly the memantine or if its more from overall sleep disruption / stress. I feel more disoriented, not confused, but basicaly more drunk but not in a fun way. Im already on effexor lamictal and guanfacine but those had no affect with alcohol. Im wondering if anyone else is on memantine and thinks its the culprit or if its less likely to he the culprit.