OP, I'm really glad you're out of that situation and safe. Once a man starts hitting you, if you stay, he will more than likely kill you.
I wouldn't doubt if amphetamines increased domestic violence. During the time I was quitting Adderall, I read plenty of horror stories of how that drug destroyed marriages and relationships. Usually once someone's partner got prescribed that junk and of course addicted, the whole relationship went to shit. Very aggressive behavior was noted. The person completely changed into a total asshole who was unrecognizable.
I will never ever date anyone with an amphetamine prescription. Not only because I know the chaos it brings, but I'm already free from that addiction, not going back.