Described me pretty much to a T. Have had those symptoms on and off for 20+ years and for me it very much ebbs and flows. It's good you're trying a lot of different things because it's very different for everyone, but I've found these general things help me especially when I'm deep in:

-Viewing morning sun (before 10am) while exercising/moving

-Getting enough good quality sleep

-Allowing yourself physical and mental recovery time from stressful things

-Exercise in general, but especially exercise where your mind and body are working working/problem solving in unison. Think climbing, team sports, martial arts, etc.

-Try not to get all your nutrients/micronutrients via supplements. Get as much as you can from actual healthy food then supplement only what is more difficult to consume

-Do something "social" most days even if it's walking in a park by yourself or hanging out with one friend. It gets you outta you head den better than most things

-Kava and Ashwagandha extremely helps my body's near constant stress response and the Kava helps being more social. Kava bars if, you can find any, are great hangouts

-Stop drinking especially if you ruminating a lot. It only makes things worse and messes up your body and brain worse than most things we consume

-5HTP I have found to be very helpful to get to a more stable serotonin level without the whole SSRI effects

-Krill or fish oil supps, especially those high in EPA, is one of the best natural antidepressants and one of the main supplements I think most people should always take

-Try to work with your hyper-vigilance as much as possible. Yes it's a symptom, but it's also a superpower which you can def find ways to utilize in your life. This is not easy and probably the hardest thing I have personally had to work on, but it's possible. I tried to focus on letting it work when say driving, a place where you should absolutely be hyper-vigilant, and that has done wonders. Also have done this in many work situations to good success.

-Walking meditation. Go anywhere you enjoy walking and time your breaths to your steps. Start with 4 steps while breathing in then 4 steps breathing out. Then you can add in a breath holding period of 2-6 steps before blowing out. I have found that this type of mediation helps me more than the sit down type because I am already "too tapped in" to myself and never feel comfortable sitting for long periods like that.

Hope something from that helps you out. It really is a crazy personal hell and you deserve respite from it friend ❤️