Reached my goal today. I did 100 squats. First set 12, second set 16, third set 72. While I was at it I did 112 consecutive sit-ups after, also a new record.
After those squats I got a throbbing headache again, which lasted about twenty something minutes. Eventually I felt like I was gonna throw up, but I didn't, felt good, and was able to eat dinner.
Don't think I'll be doing that many squats again anytime soon.