I just read through this post. I have similar problems which only started recently. I am pretty healthy and walk a lot but I have been very stressed recently, but that is not the first time I have been stressed. Life has stressful times for all of us! These will pass.
I have no anxiety issues that I am aware of. I did pass out a month or so ago whilst out at an event which was a first - but I had not eaten much that day at all, I am naturally skinny and that is probably the reason - no great mystery, if you don't eat and keep pushing yourself then by 10pm you may well feel dizzy and pass out. It seemed a logical reason although it had not happened before.
Since then, however, I have felt very dizzy most of the time. It has gone away for the odd hour but then it is back. I also feel exhausted, but then I am very tired as I am setting up my own business and have the normal stress and lack of sleep whilst lying in bed worrying about various matters and a lack of money!
But other than almost constant dizziness and tiredness, I cannot personally relate to many of the things written in this post, although I genuinely sympathise.
I have just read elsewhere that sitting in a position all day, or for many hours, with tense shoulders can cause my symptoms. This is what someone posted elsewhere 'The symptoms I had were off balance feeling, head pressure, headaches, dizzy
spells, concentration problems, terrible memory problems, I felt like I was
This can be all be down to bad posture and tense shoulders which affects the blood supply directly to the back of the head and causes the above. I am going out now to buy a decent chair to sit on and work from home on. I have also done these neck stretches sitting here ([head] forward hold 10 secs, back hold 10 secs, hold left side of head and take head down to relaxed shoulder hold 10 secs, then same to the right). These have helped a little bit but I am sitting here tense again, its become a default posture sitting here all day. I need to sort it out.
I think this is often about how we are sitting, so many of us working on computers nowadays. If you are working in an office, demand a proper chair (its a legal right in UK anyway) and set it up properly. If, like me, you are perched on wooden chair that is too low and sit with permanently hunched shoulders, tensed up (and without thinking much of it), I think (and hope) that is your problem. Nothing more.
Hope this helps someone. God Bless.