nearly blacked out while doing neck curls

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so 5 minutes ago i was doing weighted neck curls as usual i do like 30 reps so on my 10th rep i was feeling like dizzy i felt nauseous. i ignored it and kept going till my 25th rep thats when the world felt fucking heavy i just instantly laid down on my bed and the world kept fucking spinning it was so uncomfortable and i felt like i was gonna pass out i tried to stand up and fell i just kept laying down till i felt better and now im typing this so idk why happened lmk

 

[aethus]

blood flow

 

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blood flow

yea i could feel my brain moving back and forth with each rep i do i couldve fucking passed out lol