random dizziness - check
borderline fainting - check
lots of gas - check
ringing in the ears - check
"attacks" - check, including racing heart, death anxiety
No results in any medical checks as well but for what it's worth I have a lot of the triggers figured out and can mostly avoid them but sometimes it all hits out of the blue and can tie me down to whereever I am for up to 2,5 hours.
What helps me the most is to actually accept these symptoms and work through them when they occur. I have learned over the years that none of those are actually dangerous although it still is hard to use this knowledge when an attack hits.
For me the most common triggers are sleep deprivation, alcohol, cigarettes, fat food and stress but, as I said, I can be on my best for a whole week, sleeping well, eating properly, not drinking or smoking and still get the symptoms randomly out of the blue while working or just walking around town.
Anyhow, it was interesting to read about someone with a seemingly similar condition and all the best for your future!