Odd question - vegetarian diet and anger?

I have been on a vegetarian diet for about 6 weeks, and I had the same problem. I am usually very mild mannered, but lately I was very annoyed at everything. Overreacting at the smallest issue. I do eat eggs and dairy, but not every day, it was about two weeks since I had any at this point. I eat plenty of nuts, beans and grains paired with carbs to get the proper protein. I do think I was deficient in B12 and amino acids, because once I started on a vegetarian supplement, I felt a little better within a day. Much better by the third day. Lack of B12 in Vegetarian diet is something I did not take seriously enough. If you are planning on cutting out meat completely, make sure you take supplements. Little know fact, any livestock that does not graze naturally (out in a field, on grass, etc.) is given vitamin B supplements. These vitamins are essential to good health.