Greg,
TIA symptoms are very similar to stroke symptoms, mostly neurological. The fact that you blacked out, hyperventilated, and had low blood pressure doesn't sound like stroke symptoms.
Also, if you indeed had a stroke all those years ago, your cognitive function and ability to speak without effort would have improved. The brain is a powerful thing and can reroute functions, after some time.
I hope you find a solution and something that will help you be more comfortable.