Relationship with husband

Hey girls.. I'm a little worried right now.. About a few months already I noticed my husband lost so much weight and he's not a big guy so this is a big thing he looks so skinny, he's always in the bathroom for like 15-20 mins he says he needs to go poop and honestly I feel like he's hiding something ? And he also stays up at night he can't sleep.. Is there anything u might think he's taking that is hiding from me? He had drinking and smoking problems before so I'm very worried and don't get what's wrong with him, he also acts fast.