I didn't take the Busour very long once I realized that was where the headaches originated.
As far as anxiety, I ordered an otc gummy by Olly called GABA, L-Theanine. It seems to have decent reviews and doesn't interact with anything I take. I'll let you know if that helps.
The other drug I take for the fibro and have since 1998 is Tramadol. I've been able to take less since the last week or so which is nice.