It could be that drs technique that was poor.
He didn't explain anything as he was treating you?? I prefer a dr that tells me what they are doing....
Where did he work on you, all over or only head?

Oh after any PT, massage or adjusting, they should remind you to drink plenty of fluids to flush out any toxins that might have been released..
It's possible that the toxins might be why you feel much worse.. Try clear fluids and see if it helps.