I am so emotional about work right now and I just want to cry

I have been with a company for about 9 months now. It’s my first job out of college. The company has been a very good company to me so far but today my boss told me that I am going to be relocated in 2 months. I was not told about this during the hiring process and was not told I would get relocated until today. A lot of my life is already planned out and relocation does not fit into my plans. My older sister has stage IV lung cancer and I am very close to her, we talk everyday and I don’t want to move away and be away from her. Also my boyfriend of 5 years is in medical school and I will have to leave him and I don’t want to do long distance. Also I’m supposed to be a bridesmaid in a friends wedding and I won’t be able to be in the wedding. I don’t know what to do, I am already in debt and I have some medical things going on. I don’t know how to tell my boss I won’t go through with it. A lot of my life is already planned out and I’m so emotional about it.