This Monday I had a deadlift session where I worked up to a top set of five. The warmup went as follows: 135x5 185x3 225x1 and my top set was 255x5. After this set I felt a little light headed, but I've often felt like it before so I didn't think about it too much. I then went on and did 275x1, planning on doing a few singles with it, but as I lowered the weight, I immediately had a huge headache.
It was so bad I had to sit down for five minutes and was extremely dizzy. I still have this headache and I'm wondering what I did wrong? I've never noticed my breathing before, so should I focus more on that? I'm wondering if I could have burst a blood vessel or had an aneurysm? Any advice or info on what could have happened and tips so it won't happen again? Thanks guys.