I think my dad is on withdrawal from his drugs?

So... I know my dad uses. & I know that him and my mom separated from him doing meth constantly when I was about three.. I'm sixteen now. & he's been on it the years before I was born, (1993). He stays up all night almost every night. It's strange. Like i'll wake up at like 545 in the morning sometimes if I have to go to the bathroom, and he'll still be awake. sometimes he's still up at 6. It's crazy. Than he has off on sundays and mondays. & he'll just sleep forEVER. I'll come home from school and he'll be sick on the couch... still didn't get up from when he went to sleep. But than come tuesday..he'll go back to work and be up all night again. Is this symptoms of still being on meth? I hear him and his girlfriend argue all the time, and he yells at her for her "cocaine abuse" so thats obviously how i found out shes on coke. Then she screams at him about his "blueberries" and to call glenn, (which is his drug dealer) to "calm him down". & i looked that up.. their valiums and they come in like perscription bottles.. there's a ton in my bathroom cabinet. He's been sick the past couple of days.. like throwing up, can't do anything himself, saying he thinks hes gunna die and stuff... crying... my aunts thought it was swine flu. But him and his girlfriend were arguing again tonight, and she was like, "YOUR SICK BECAYSE YOUR ON YOUR WITHDRAWAL FROM YOUR BLUEBERRIES FROM GLENN..PLAYING THIS I HAVE THE FLU BULL****, GUESS YOU NEED TO CALL GLENN AGAIN." I don't really know the symptoms of withdrawal from meth or valiums.. someone wanna help me out here?