Unable to find the cause =(

Something to consider. You feel fine when talking with friends - that's because you are then in the MIDST of what is TRULY happening, it is true reality. Then when you are on your own, you let the "unreal" thoughts come to your mind. Don't trust those thoughts - they are NOT reality. Take it from me, I know how it happens. I have had to constantly tell myself not to let the "stories" in my head take over. When you are by yourself, constantly try to PRAISE yourself when you are keeping these "thoughts" at bay. Over time, it should get better, but it might take awhile to get back into the swing of how to "talk" to yourself. What helps ME when I'm in that "mode" and trying to "get back", is taking L-Theanine (an amino acid derived from green tea).It naturally puts your nerve system into a calm mode. Look it up. A preventative practitioner once told me about it, and now I always try to keep a stash of it for those "jittery" times. Best of luck!

Okay something else - random flush? I don't know your age, but could you possible be at the age of peri-menopause? Because when I get hot flash (I'm 67), it seems to trigger anxiety - that is, when I feel hot, my mind goes to "uh oh - I'm getting anxious again" - when in fact, it's just a hot flash. I tell myself to just ride through it for a few minutes, and when it's over, I realize that's all it was.

If you are looking to find the physical brain disorder, one that can be treated, and usually to the point of cure, while also being an infection that mainstream medicine will not currently acknowledge, consider Lyme. 3M people a year get it in the US, most without initially noticing, and since most are rarely diagnosed we have ongoing infections that average about a third of US Americans will be infected in our lifetimes. You want to find out early because it can progress quickly and stubbornly and be expensive. At any rate, I am experiencing anxiety lately which I don't have much of a history of until the last few years. I had cleared up a Bartonella infection and then this Babesia red blood cell brain infection then grew like a new infection. Mostly I experience anxiety, fatigue, brain fog, brain pressure and sometimes odd but not particularly painful brain sensations. There are half a dozen diseases you can get from a tick and they are collectively called Lyme. I hope this helps and if it does, please come back and help others.

Glad to hear all tests showed good! Mucus in throat - I experience from time to time too. I know how exhausting it is when it gets too much and you have to "cough/spit" (!) I notice it's due to things I eat: mainly, hot, spicy food! Anyway, welcome to the super-sensitive club! Think positively - there are SOME advantages to being hyper-sensitive ---- we notice health issues sooner than others, so if there IS a problem, it's SEEN sooner. We just have to try to 'relax/meditate/positive self-talk' more in order to try to keep our "health anxiety" in check.
Good you cleared up that you were male - now we won't jump to your flushing symptoms being due to menopause!

Hi Topo!
Thanks for the heads up! Yes spicy food. Strangely, because we're so accustomed to eating spicy food, I've never gotten for an extended duration of like a few days. I take some mucus dissolvers(idk what but its a sachet and mixed with water), and it gets better.

Agreed on the positive self-talk. I noticed it, I feel scared, then I try swallowing and breathing deep to tell myself that these core functions are the most important.
Funny all the symptoms are randomised, because now the flushing is gone! haha.

Btw, I've recently did some mindfulness, and am trying to correct my shaking legs problem. Apparently reading about this, it seems like it's to ward off the anxiety/stress. Similar to twirling thumbs.

Yeah! It’s great stuff. Mindfulness is not easy to master with so many distractions. Jeez, tryna meditate and 3mins later i get called out. Lol.

So many techniques i have yet to try. Like foot reflexology for calmness...