I never cared how much came out the main thing is you had a good detox.
That you have a headache is interesting to me, don't read that too often. I had a killer headache, but I grew up since childhood with sinus problems. After about 4 months I realized I had gotten rid off my allergies, never got them back. Still had my gallstone :) actually after 15 years still have 2.8cm stone.
So be positive, you did it and have a great result. Keep flushing!