Anything else happening before you pass out? Vertigo for example? Is it always happen when you hit a certain pain threshold? Do you get the champagne bubbles popping in your head before you drop?

It's really hard to pinpoint the cause of some of this stuff. By the time you get insurance approval, lots of times it will clear up if it's intermittent, and then it'll return months or even years later. So, frustrating! This might actually be an example of a good time to visit the ER, right after a fall. They'll likely perform tests that are time sensitive.

Also, were you passing out prior to taking Lyrica? It could be a serious side effect to your taking the medication. I've personally always had bad reactions to that type of med.