I have had mood swings too. I still don't know what caused them but they happened a few months after being diagnosed. I attributed them to adjusting to my diagnosis and going through the grieving process. My husband was extremely supportive and helped me get through them. I let both my neurologist and my pcp know and we did a watch and wait sort of strategy. I did mellow out over a few months. Mood swings can be caused by so many things. Let your doctor(s) know. I am a teacher as well (5th grade) and that is a stressful job. Make sure you are taking really good care of yourself until you are feeling more like yourself again. Good luck and let us know how you are doing.
Love and prayers,