Husband making horrible decisions.

I don’t know what to do. I’ve been with my husband for almost 10 years, married for 2. But I’m really about to be all done. His decisions lately have been questionable and I’m sure most of it is stress induced, but I’m not sure. He’s studying for his Series 7 license and his CPA exam. He got adderall, not prescribed, and hid it from me. He’s been drinking a lot more lately, like a bottle of wine every 1-2 days. And he was out last night until 3am. He also makes horrible decisions when it comes to our children. He puts our 1 year old forward facing in his car, instead of taking 30 seconds to flip it around. And if he has both kids, he’ll put the 1 year old forward facing and our 5 year old just buckled in the regular seat. He’s also let our 5 year old sit in the front seat for a 5 minute drive to his parents. Yesterday, his sister picked our oldest up from camp, which she wasn’t supposed to and not on the release form, but she also doesn’t have a car seat. So our oldest was just buckled into the back. And my husband only says “it’s only a short drive, it’s only a few blocks away”. I’m tired of having to stress to him the importance of these things. Idk what else to do?! God forbid something happens on one of these short rides. I would never forgive him or myself. I just don’t know what to do.