I'm sensitive to histamine as well and I'm using a dietary supplement for a long time. It makes my life so easy because I can go out without being worried or stuff like that. I can eat everything, doesn't matter if it's histamine rich or not. I found it online and I got it recommended by some users within a allergy forum. The supplement is called Daosin. Well probably some guys of you are able to take it too. Your doctor will help you and will inform you about it, I guess.
Does somebody else know's a therapy or whatever against histmaine intolerance?