This has happened to me before too...
My first time in an ACE suit with the straps up, working on technique.
Also has happened after deadlifts.
Also nose bleeds, busted blood vessels, ect.
All that before I took anything.
Now that I am on, oddly enough it doesn't happen. Mostly because I tried to get in a little better shape and get my blood pressure under control.
I still turn purple, and vision is always blurry a few minutes after heavy squats, and I still have places on my face (I still have acne) pop and bleed, but no passing out.
Last week I did some reps with 600 raw, and thought I was going to pass out. Especially walking it back in. As soon as I racked it I just laid down on the floor because I was halfway expecting to pass and didn't want to fall into something haha
IMO, it comes with the territory usually, although it could be a problem, so get it checked out if you are concerned.
I never have (nor do I plan to) worry about mine.