Today after I did a max set of 12 chins(2 more reps than my previous PR) I got a bad headache, felt very nautious, and just shitty. Is this normal after hitting true failure or should I see a doctor?
You were most likely straining VERU hard seeing as you hit a new PR and failed there. It was a combo of that and most likely holding your breath which made you BP skyrocket. Very Normal. Ive had it also.
Now if it becomes a regular occurance probably goo to get checked out.
It’s also possible that you may have shifted a vertebre or two slightly out of position as well. Does it feel like anything needs to pop?
Probably nothing to worry about unless it happens consistently in the future, though.