Anxiety issues tend not to really go away for many people. It may for some, but its usually managed appropriately in those cases.
Anxiety management might take years of practice. For others, just slowing down and taking a few breaths works.
For me personally, a start was to completely quit alcohol. One of my triggers for anxiety was thinking about all the stupid shit I did when I was drunk. That has mostly gone away as I seemed to have stopped doing stupid shit as much. Also, hangovers and alcohol dependency contribute to anxiety which triggers more drinking.. etc..
To break the cycle of negative thoughts during anxiety attacks, I have to basically meditate and take time let go of my thoughts. It's not easy in some cases.
For me, anxiety is an extremely cyclical train of thought that mostly follows a pattern: If A happens, then B will happen. After issue B comes C, which causes A again. Repeat a million more times.
That is kind of a stupid explanation because it's much more complex than that.
Exercise helps, but that is hard during the winters here, even more so because I sit on my ass all day for work and my hobbies. It's absolutely something I need to work on because of my age, for sure.
There are a million-and-one reasons for anxiety and managing it takes a ton of self-awareness. That takes practice.
Also, if you have unresolved conflict, do what you can to resolve it. Seek counseling if needed as that can really help resolve those kinds of things. Having a past that haunts you is not healthy.