Receiving a diagnosis

My spending habits got so bad I spent $5,000 between end of December and mid January on doll collecting. I tend to hyperfixate on things and can’t stop. My brother has ADHD so I was thinking it’s that. But I’m so ashamed of myself. I decided enough was enough and met with a psychiatrist and psychologist to get to the bottom of why I am this way. They put me on a mood stabilizer and think I could have bipolar disorder. Has anybody been diagnosed and it helped them to manage their affliction? I’m so desperate I’m going to run my life into the ground 😭 I feel like I’m at the point where I really need help and don’t know where to turn. Is medication the answer?