Hi there Caityyyxx,
I am sorry you are having these symptoms, but no, you are not alone..I get those symptoms as well, along with other symptoms including confusion/brain fog, feeling like in a dream, forgetting things (basic things), numbness in face, hands and feet etc, feeling like I am going to pass out and many many more things.
I am a bit older than you (37 yo) and have had these sorts of symptoms for around 7 yrs. Which coincides with when my anorexia got really bad and also insomnia and anxiety and depression starting to creep in (although I didn't know I had anxiety and depression at the time). So I and my Dr put it down to a starved body and brain. Which is part of the problem/cause for me...but I totally think more of it is from the mental stress and that this doesn't get enough attention from some Drs.
You seem very aware of your own health which is great. Definitely get a blood test to check everything. I have mine regularly tested and have lots of low levels such as iron and ferritin which mean that I have iron deficiency anaemia and this causes some of these symptoms which you have described - and/or can make those symptoms worse. This is fixed with iron replacement. But the mental stress and as you say trauma can cause all this too. I also have complex PTSD so believe getting some professional help for that will help us also. I haven't started this yet but plan to soon as Covid eases a bit.
It sounds like you are doing the right things to get some answers and hopefully knowing others experience this also can reassure you somewhat. I think a big part of it is having some self soothing ideas to try calm mind in the time of panic and try think less about feeling like going to pass out. Good luck with finding some answers and getting some help to feel better :)