Is it normal to have mood swings when you dealing with separation?

[Lala M]

Hello, I was married over 11 years, my husband and I dind't have the best relationship, but, I thought it was normal since I loved him and he said he loved me, but six weeks he came and deicde to get separeted, next day I found out he had somebody else, and next day he ask for divorce, we have three children, and i've been tryng to get along with his dad the best I can, but sometimes the anger comes to me and we argue, and other times we get along, today he intoduce his new girlfriend to my kids, and I went crazy I got super mad, because I thought it's so soon, and now him and his family are trying to say that I'm bipolar. Isn't it normal that I'm inshock and I'm dealing with everything, with brake up of our marriage, knowing he cheated on me, and now that he is going with his new girlfriend, her daughter and my children to the zoo like a family, my life turn in three days upside down....I,m I wrong to feel this way? I know there is not going back, but that doesn't mean I'm not hurt.