The not so good news: ADHD isn't going anywhere. It can affect many aspects of life. It's something that needs constant attention and there is no magical silver bullet that will fix all of you problems.
I struggled through university and then didn't really make much career progress in my 20s. I was diagnosed at 30 and started taking stimulant medication. Well my life since then has not been perfect it's definitely on an upward trend. I'm doing better at work and in interpersonal relationships. You've already noticed emotional disregulation in yourself.
Start by informing yourself. There is a lot of bad information around about ADHD. Russell Barkley[1] is an expert on the topic and a great place to start. His free talks are available on youtube and made me realize the extent of my problem. His book, Taking Charge of Adult ADHD,