I have dealt with anxiety and depression since I was a child. I have had counseling, done a lot of work on meditation, mindfulness, ready many books over the years (REBT, CBT, ACT, Morita Therapy, meditation, on and on...). I have improved over the last 30 years, but when I get to a point where I feel uncertain (mainly work related). In my work (high-tech) things change so fast and it takes a lot of effort to keep up to date and position yourself so your skills are not irrelevant. It is like a never-ending race and there is No Finish Line.
The physical discomfort is so intense that it sucks me in, then negative fear-based thoughts just start going around and around in my head. I found with vipassana meditation (not struggling against these feeling helps) but at times I am so stuck it seems I cannot break out of these for days. Finally, I "wake" up and journal or talk to someone and this internal battle settles down.
If anyone has worked through a process to help with excessive worry (about something you cannot control) I would like to hear about it. What has helped me is meditation, Stoicism, rest, but at times these things are not enough. I feel like I want to reach into my mind and just remove these thoughts and way of being, they have such a hold on me at times I feel like a prisoner of my own mind.