What Causes Sudden Fainting And Drooling While On Gabapentin?

my husband is in extreme pain. he has gone through two back surgeries previously. he barely has feeling in his left leg. his first surgery he had blown out the bottom disk and a piece went down the nerve canal to his sciatic nerve and almost severed it into half. the piece was about the size of the top of my thumb. the second surgery was a short time later he blew out the disc right above the last one. now he has no pain meds because our doctor cut him off them cold turkey. after taking norco 10-325 for several years. he takes gabapentin 600 numerous times a day. the pain is getting worse every day. this morning he got up made it to the bathroom. he can barely walk in the mornings and at several times through the day. he started feeling nauseous and went to the toilet. all of a sudden he was face first on the toilet seat, then when i went to help his eyes were rolling back into his head, he had started drooling, making snoring sounds, was unresponsive, and was just about lifeless laying in the floor. I tried to wake him and got no response for a bout a full two-three minutes. I got help and we were picking him up out the floor and he came to. he didn t know what was going on asked how he got there what was going on at all. He didn t remember anything. and this afternoon it almost happen again. what should I do? He refuses to seek emergency room help. I am scared like you would not believe. Please help!!!!!!!!!!!!!