Need psychiatric evaluation for behavior

I'm planning to see a psychiatrist because I feel like my thoughts, emotions, and behavior have changed a lot over the past few years. I experience constant overthinking, stress, chest pain (medical tests were normal), sleep paralysis, emotional ups and downs, and I don't feel like myself anymore. One thing that worries me the most is that I've started having intense anger and revenge-related thoughts toward someone. I don't understand why my mind has changed like this, and it scares me because this isn't how I used to think. I've also gone through a lot emotionally, and I want to understand whether all of this could be connected. Has anyone experienced something similar? What was your experience with seeing a psychiatrist, and did it help?