Obviously I can't tell you if it's vitamin B or not since I'm not a dr, but I see a lot of forum posts online from various websites saying that vitamin B makes them angry.

Who put you on vitamin B? Was it a dr?

My grandma gets vitamin B shots and she's okay anger wise... so it's possible your vitamin B dose is too high or something. I would ask a dr to figure out what dose you should use if you're going to use it