Please help

I have never felt so useless in my entire life. My daughter left me 2 weeks ago and now my boyfriend of 2 years just told me he didn't love me anymore and left me. 
I can't handle all of these emotions right now.  I feel unwanted. I feel useless. I feel weak. I feel unmotivated to do anything but mope around and cry. But worst of all I can't get over the fact that my daughter passed away and the father at a time like this just up and leave me. What did I do to deserve this?
I have never had depression hit me this hard before and I honestly don't even want to live anymore. I told my ex this and he doesn't care. I can't handle this.