Extreme Period Pain

I have extreme period pain. I am 16 and have had my period for 4 years. The past school year I kept texting my mom every time my period would start because the pain was unbearable and I felt like I was going to sh*t my self. Sometimes I am at home when it starts and my mom will say that it is just my period and you need to get used to it. I know that I’m not good with pain but at this point when she says this it makes me mad. Do I have something else like a disease related to menstruating or what. (Also just in case it is relevant I have had stomach ulcers due to stress and I have moderate reoccurring depression- that is the exact diagnosis I got)