Vitaman b12 symptoms and conditions

I just started taking Yasmin last month. Throughout the month I couldn't realise why I wasn't my self at all. I was extremely anti-social, which is extremely out of my character. I was waking up feeling depressed not even wanting to get out of bed. I would cry at the drop of a hat! I was in the grocery store getting some vitaman B12, which just so you know does help with your mood and temprorarily was the only thing that would. I would also CONSTANTLY feel hungry, to the point of eating double the amount I regularly could. In the past month I have gained about 5 pounds, and I am very active.
This past week I haven't been taking them because I have been on my period, and I notice I actually wake up in a good mood, and feel so much happier. My appetite is back to normal after a few days, i guess cause I wasnt on the pill that long. I'm defintly going to try something else because I just didn't feel my self at all. What you guys are describing is exactly how I would feel... and I was afraid it would cause problems between friendships, and my relationship with my boyfriend. Defintly don't recommend this pill at all.