Just looking for some support (job/friend)

I've lurked TwoXChromosomes for a while and figured I ought to finally register a Reddit account...

Today sucks. I work at an engineering firm and got a promotion 2 weeks ago. Normally this would be exciting, but this entire month has been terrible except for that promotion. My boyfriend cheated on me (with my sister....), one of my cats died, and my mother had surprise leg surgery (she's expected to make a full recovery).

Anyway, this new position is a lot more difficult than I expected, and I'm really struggling to keep up with everything even though I'm putting in 10 hours a day, 6 days a week.

I was complaining about this to my best friend just a little while ago, and he absolutely blew up on me after like 2 minutes of listening to me. He went on a long tirade about how I'm lazy, can't do anything right, annoying, and how I shouldn't have this job (he and I work in the same field and went to school together. We both applied for my former position after we graduated, and I was the one that was offered it. I'm not sure why I was chosen first, as he had better recommendations/internships/much better grades, I guess I had the better interview. I don't know why he's still mad about it, he ended up getting a better position anyway...). I broke down in tears in the middle of it and have been sobbing ever since.

Well, that's my story. I'm going to go see if I have any ice cream or alcohol in the freezer.