So pretty much every time I do heavy deadlift day (250 lbs or higher, generally--under that seems to be fine), I feel super lightheaded after I put the bar down for several seconds. I haven't passed out ever, but sometimes I need to hold onto something until it goes away. And yes, I promise I have great deadlift form and am breathing correctly. I also get this to a lesser degree from heavy squats sometimes. I assume it's not a real issue, but was wondering if it happens to anyone else or if I should be concerned at all.
Also, I dislike deadlifts. Always have. Love lifting weights, though. I know they're pretty necessary for me.